diff options
Diffstat (limited to 'test/test-pages/002/expected.html')
-rw-r--r-- | test/test-pages/002/expected.html | 244 |
1 files changed, 122 insertions, 122 deletions
diff --git a/test/test-pages/002/expected.html b/test/test-pages/002/expected.html index 964d7d6..d836b60 100644 --- a/test/test-pages/002/expected.html +++ b/test/test-pages/002/expected.html @@ -1,4 +1,4 @@ -<article class="post" role="article"><p>For more than a decade the Web has used XMLHttpRequest (XHR) to achieve +<div><article class="post" role="article"><p>For more than a decade the Web has used XMLHttpRequest (XHR) to achieve asynchronous requests in JavaScript. While very useful, XHR is not a very nice API. It suffers from lack of separation of concerns. The input, output and state are all managed by interacting with one object, and state is @@ -30,37 +30,37 @@ In its simplest form it takes a URL and returns a promise that resolves to the response. The response is captured as a <code>Response</code> object.</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;">fetch<span style="color: #009900;">(</span><span style="color: #3366CC;">"/data.json"</span><span style="color: #009900;">)</span>.<span style="color: #660066;">then</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>res<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - <span style="color: #006600; font-style: italic;">// res instanceof Response == true.</span> - <span style="color: #000066; font-weight: bold;">if</span> <span style="color: #009900;">(</span>res.<span style="color: #660066;">ok</span><span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - res.<span style="color: #660066;">json</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span>.<span style="color: #660066;">then</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>data<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>data.<span style="color: #660066;">entries</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> - <span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> - <span style="color: #009900;">}</span> <span style="color: #000066; font-weight: bold;">else</span> <span style="color: #009900;">{</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Looks like the response wasn't perfect, got status"</span><span style="color: #339933;">,</span> res.<span style="color: #660066;">status</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> - <span style="color: #009900;">}</span> -<span style="color: #009900;">}</span><span style="color: #339933;">,</span> <span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>e<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Fetch failed!"</span><span style="color: #339933;">,</span> e<span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript">fetch<span>(</span><span>"/data.json"</span><span>)</span>.<span>then</span><span>(</span><span>function</span><span>(</span>res<span>)</span> <span>{</span> + <span>// res instanceof Response == true.</span> + <span>if</span> <span>(</span>res.<span>ok</span><span>)</span> <span>{</span> + res.<span>json</span><span>(</span><span>)</span>.<span>then</span><span>(</span><span>function</span><span>(</span>data<span>)</span> <span>{</span> + console.<span>log</span><span>(</span>data.<span>entries</span><span>)</span><span>;</span> + <span>}</span><span>)</span><span>;</span> + <span>}</span> <span>else</span> <span>{</span> + console.<span>log</span><span>(</span><span>"Looks like the response wasn't perfect, got status"</span><span>,</span> res.<span>status</span><span>)</span><span>;</span> + <span>}</span> +<span>}</span><span>,</span> <span>function</span><span>(</span>e<span>)</span> <span>{</span> + console.<span>log</span><span>(</span><span>"Fetch failed!"</span><span>,</span> e<span>)</span><span>;</span> +<span>}</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>Submitting some parameters, it would look like this:</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;">fetch<span style="color: #009900;">(</span><span style="color: #3366CC;">"http://www.example.org/submit.php"</span><span style="color: #339933;">,</span> <span style="color: #009900;">{</span> - method<span style="color: #339933;">:</span> <span style="color: #3366CC;">"POST"</span><span style="color: #339933;">,</span> - headers<span style="color: #339933;">:</span> <span style="color: #009900;">{</span> - <span style="color: #3366CC;">"Content-Type"</span><span style="color: #339933;">:</span> <span style="color: #3366CC;">"application/x-www-form-urlencoded"</span> - <span style="color: #009900;">}</span><span style="color: #339933;">,</span> - body<span style="color: #339933;">:</span> <span style="color: #3366CC;">"firstName=Nikhil&favColor=blue&password=easytoguess"</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span>.<span style="color: #660066;">then</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>res<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - <span style="color: #000066; font-weight: bold;">if</span> <span style="color: #009900;">(</span>res.<span style="color: #660066;">ok</span><span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - alert<span style="color: #009900;">(</span><span style="color: #3366CC;">"Perfect! Your settings are saved."</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> - <span style="color: #009900;">}</span> <span style="color: #000066; font-weight: bold;">else</span> <span style="color: #000066; font-weight: bold;">if</span> <span style="color: #009900;">(</span>res.<span style="color: #660066;">status</span> <span style="color: #339933;">==</span> <span style="color: #CC0000;">401</span><span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - alert<span style="color: #009900;">(</span><span style="color: #3366CC;">"Oops! You are not authorized."</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> - <span style="color: #009900;">}</span> -<span style="color: #009900;">}</span><span style="color: #339933;">,</span> <span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>e<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - alert<span style="color: #009900;">(</span><span style="color: #3366CC;">"Error submitting form!"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript">fetch<span>(</span><span>"http://www.example.org/submit.php"</span><span>,</span> <span>{</span> + method<span>:</span> <span>"POST"</span><span>,</span> + headers<span>:</span> <span>{</span> + <span>"Content-Type"</span><span>:</span> <span>"application/x-www-form-urlencoded"</span> + <span>}</span><span>,</span> + body<span>:</span> <span>"firstName=Nikhil&favColor=blue&password=easytoguess"</span> +<span>}</span><span>)</span>.<span>then</span><span>(</span><span>function</span><span>(</span>res<span>)</span> <span>{</span> + <span>if</span> <span>(</span>res.<span>ok</span><span>)</span> <span>{</span> + alert<span>(</span><span>"Perfect! Your settings are saved."</span><span>)</span><span>;</span> + <span>}</span> <span>else</span> <span>if</span> <span>(</span>res.<span>status</span> <span>==</span> <span>401</span><span>)</span> <span>{</span> + alert<span>(</span><span>"Oops! You are not authorized."</span><span>)</span><span>;</span> + <span>}</span> +<span>}</span><span>,</span> <span>function</span><span>(</span>e<span>)</span> <span>{</span> + alert<span>(</span><span>"Error submitting form!"</span><span>)</span><span>;</span> +<span>}</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>The <code>fetch()</code> function’s arguments are the same as those passed @@ -79,36 +79,36 @@ <p>The <a href="https://fetch.spec.whatwg.org/#headers-class">Headers interface</a> is a simple multi-map of names to values:</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> content <span style="color: #339933;">=</span> <span style="color: #3366CC;">"Hello World"</span><span style="color: #339933;">;</span> -<span style="color: #000066; font-weight: bold;">var</span> reqHeaders <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> Headers<span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -reqHeaders.<span style="color: #660066;">append</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Content-Type"</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">"text/plain"</span> -reqHeaders.<span style="color: #660066;">append</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Content-Length"</span><span style="color: #339933;">,</span> content.<span style="color: #660066;">length</span>.<span style="color: #660066;">toString</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -reqHeaders.<span style="color: #660066;">append</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"X-Custom-Header"</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">"ProcessThisImmediately"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> content <span>=</span> <span>"Hello World"</span><span>;</span> +<span>var</span> reqHeaders <span>=</span> <span>new</span> Headers<span>(</span><span>)</span><span>;</span> +reqHeaders.<span>append</span><span>(</span><span>"Content-Type"</span><span>,</span> <span>"text/plain"</span> +reqHeaders.<span>append</span><span>(</span><span>"Content-Length"</span><span>,</span> content.<span>length</span>.<span>toString</span><span>(</span><span>)</span><span>)</span><span>;</span> +reqHeaders.<span>append</span><span>(</span><span>"X-Custom-Header"</span><span>,</span> <span>"ProcessThisImmediately"</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>The same can be achieved by passing an array of arrays or a JS object literal <br></br>to the constructor:</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;">reqHeaders <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> Headers<span style="color: #009900;">(</span><span style="color: #009900;">{</span> - <span style="color: #3366CC;">"Content-Type"</span><span style="color: #339933;">:</span> <span style="color: #3366CC;">"text/plain"</span><span style="color: #339933;">,</span> - <span style="color: #3366CC;">"Content-Length"</span><span style="color: #339933;">:</span> content.<span style="color: #660066;">length</span>.<span style="color: #660066;">toString</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #339933;">,</span> - <span style="color: #3366CC;">"X-Custom-Header"</span><span style="color: #339933;">:</span> <span style="color: #3366CC;">"ProcessThisImmediately"</span><span style="color: #339933;">,</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript">reqHeaders <span>=</span> <span>new</span> Headers<span>(</span><span>{</span> + <span>"Content-Type"</span><span>:</span> <span>"text/plain"</span><span>,</span> + <span>"Content-Length"</span><span>:</span> content.<span>length</span>.<span>toString</span><span>(</span><span>)</span><span>,</span> + <span>"X-Custom-Header"</span><span>:</span> <span>"ProcessThisImmediately"</span><span>,</span> +<span>}</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>The contents can be queried and retrieved:</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;">console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>reqHeaders.<span style="color: #660066;">has</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Content-Type"</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// true</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>reqHeaders.<span style="color: #660066;">has</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Set-Cookie"</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// false</span> -reqHeaders.<span style="color: #000066; font-weight: bold;">set</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Content-Type"</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">"text/html"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -reqHeaders.<span style="color: #660066;">append</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"X-Custom-Header"</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">"AnotherValue"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> + <table><tbody><tr><td class="code"><pre class="javascript">console.<span>log</span><span>(</span>reqHeaders.<span>has</span><span>(</span><span>"Content-Type"</span><span>)</span><span>)</span><span>;</span> <span>// true</span> +console.<span>log</span><span>(</span>reqHeaders.<span>has</span><span>(</span><span>"Set-Cookie"</span><span>)</span><span>)</span><span>;</span> <span>// false</span> +reqHeaders.<span>set</span><span>(</span><span>"Content-Type"</span><span>,</span> <span>"text/html"</span><span>)</span><span>;</span> +reqHeaders.<span>append</span><span>(</span><span>"X-Custom-Header"</span><span>,</span> <span>"AnotherValue"</span><span>)</span><span>;</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>reqHeaders.<span style="color: #000066; font-weight: bold;">get</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Content-Length"</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// 11</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>reqHeaders.<span style="color: #660066;">getAll</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"X-Custom-Header"</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// ["ProcessThisImmediately", "AnotherValue"]</span> +console.<span>log</span><span>(</span>reqHeaders.<span>get</span><span>(</span><span>"Content-Length"</span><span>)</span><span>)</span><span>;</span> <span>// 11</span> +console.<span>log</span><span>(</span>reqHeaders.<span>getAll</span><span>(</span><span>"X-Custom-Header"</span><span>)</span><span>)</span><span>;</span> <span>// ["ProcessThisImmediately", "AnotherValue"]</span> -reqHeaders.<span style="color: #000066; font-weight: bold;">delete</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"X-Custom-Header"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>reqHeaders.<span style="color: #660066;">getAll</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"X-Custom-Header"</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// []</span></pre> +reqHeaders.<span>delete</span><span>(</span><span>"X-Custom-Header"</span><span>)</span><span>;</span> +console.<span>log</span><span>(</span>reqHeaders.<span>getAll</span><span>(</span><span>"X-Custom-Header"</span><span>)</span><span>)</span><span>;</span> <span>// []</span></pre> </td> </tr></tbody></table></div> <p>Some of these operations are only useful in ServiceWorkers, but they provide @@ -136,12 +136,12 @@ console.<span style="color: #660066;">log</span><span style="color: #009900;">(< <a href="https://fetch.spec.whatwg.org/#concept-header-name">valid HTTP Header name</a>. The mutation operations will throw TypeError if there is an immutable guard. Otherwise they fail silently. For example:</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> res <span style="color: #339933;">=</span> Response.<span style="color: #660066;">error</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #000066; font-weight: bold;">try</span> <span style="color: #009900;">{</span> - res.<span style="color: #660066;">headers</span>.<span style="color: #000066; font-weight: bold;">set</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Origin"</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">"http://mybank.com"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span> <span style="color: #000066; font-weight: bold;">catch</span><span style="color: #009900;">(</span>e<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Cannot pretend to be a bank!"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> res <span>=</span> Response.<span>error</span><span>(</span><span>)</span><span>;</span> +<span>try</span> <span>{</span> + res.<span>headers</span>.<span>set</span><span>(</span><span>"Origin"</span><span>,</span> <span>"http://mybank.com"</span><span>)</span><span>;</span> +<span>}</span> <span>catch</span><span>(</span>e<span>)</span> <span>{</span> + console.<span>log</span><span>(</span><span>"Cannot pretend to be a bank!"</span><span>)</span><span>;</span> +<span>}</span></pre> </td> </tr></tbody></table></div> @@ -153,9 +153,9 @@ console.<span style="color: #660066;">log</span><span style="color: #009900;">(< <p>The simplest Request is of course, just a URL, as you may do to GET a resource.</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> req <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> Request<span style="color: #009900;">(</span><span style="color: #3366CC;">"/index.html"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>req.<span style="color: #660066;">method</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// "GET"</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>req.<span style="color: #660066;">url</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// "http://example.com/index.html"</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> req <span>=</span> <span>new</span> Request<span>(</span><span>"/index.html"</span><span>)</span><span>;</span> +console.<span>log</span><span>(</span>req.<span>method</span><span>)</span><span>;</span> <span>// "GET"</span> +console.<span>log</span><span>(</span>req.<span>url</span><span>)</span><span>;</span> <span>// "http://example.com/index.html"</span></pre> </td> </tr></tbody></table></div> <p>You may also pass a Request to the <code>Request()</code> constructor to @@ -164,9 +164,9 @@ console.<span style="color: #660066;">log</span><span style="color: #009900;">(< is covered in <br></br>the “Reading bodies” section.).</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> copy <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> Request<span style="color: #009900;">(</span>req<span style="color: #009900;">)</span><span style="color: #339933;">;</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>copy.<span style="color: #660066;">method</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// "GET"</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>copy.<span style="color: #660066;">url</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// "http://example.com/index.html"</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> copy <span>=</span> <span>new</span> Request<span>(</span>req<span>)</span><span>;</span> +console.<span>log</span><span>(</span>copy.<span>method</span><span>)</span><span>;</span> <span>// "GET"</span> +console.<span>log</span><span>(</span>copy.<span>url</span><span>)</span><span>;</span> <span>// "http://example.com/index.html"</span></pre> </td> </tr></tbody></table></div> <p>Again, this form is probably only useful in ServiceWorkers.</p> @@ -174,13 +174,13 @@ console.<span style="color: #660066;">log</span><span style="color: #009900;">(< initial <br></br>values as a second argument to the constructor. This argument is a dictionary.</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> uploadReq <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> Request<span style="color: #009900;">(</span><span style="color: #3366CC;">"/uploadImage"</span><span style="color: #339933;">,</span> <span style="color: #009900;">{</span> - method<span style="color: #339933;">:</span> <span style="color: #3366CC;">"POST"</span><span style="color: #339933;">,</span> - headers<span style="color: #339933;">:</span> <span style="color: #009900;">{</span> - <span style="color: #3366CC;">"Content-Type"</span><span style="color: #339933;">:</span> <span style="color: #3366CC;">"image/png"</span><span style="color: #339933;">,</span> - <span style="color: #009900;">}</span><span style="color: #339933;">,</span> - body<span style="color: #339933;">:</span> <span style="color: #3366CC;">"image data"</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> uploadReq <span>=</span> <span>new</span> Request<span>(</span><span>"/uploadImage"</span><span>,</span> <span>{</span> + method<span>:</span> <span>"POST"</span><span>,</span> + headers<span>:</span> <span>{</span> + <span>"Content-Type"</span><span>:</span> <span>"image/png"</span><span>,</span> + <span>}</span><span>,</span> + body<span>:</span> <span>"image data"</span> +<span>}</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>The Request’s mode is used to determine if cross-origin requests lead @@ -192,12 +192,12 @@ console.<span style="color: #660066;">log</span><span style="color: #009900;">(< this to ensure that <br></br>a request is always being made to your origin.</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> arbitraryUrl <span style="color: #339933;">=</span> document.<span style="color: #660066;">getElementById</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"url-input"</span><span style="color: #009900;">)</span>.<span style="color: #660066;">value</span><span style="color: #339933;">;</span> -fetch<span style="color: #009900;">(</span>arbitraryUrl<span style="color: #339933;">,</span> <span style="color: #009900;">{</span> mode<span style="color: #339933;">:</span> <span style="color: #3366CC;">"same-origin"</span> <span style="color: #009900;">}</span><span style="color: #009900;">)</span>.<span style="color: #660066;">then</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>res<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Response succeeded?"</span><span style="color: #339933;">,</span> res.<span style="color: #660066;">ok</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span><span style="color: #339933;">,</span> <span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>e<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Please enter a same-origin URL!"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> arbitraryUrl <span>=</span> document.<span>getElementById</span><span>(</span><span>"url-input"</span><span>)</span>.<span>value</span><span>;</span> +fetch<span>(</span>arbitraryUrl<span>,</span> <span>{</span> mode<span>:</span> <span>"same-origin"</span> <span>}</span><span>)</span>.<span>then</span><span>(</span><span>function</span><span>(</span>res<span>)</span> <span>{</span> + console.<span>log</span><span>(</span><span>"Response succeeded?"</span><span>,</span> res.<span>ok</span><span>)</span><span>;</span> +<span>}</span><span>,</span> <span>function</span><span>(</span>e<span>)</span> <span>{</span> + console.<span>log</span><span>(</span><span>"Please enter a same-origin URL!"</span><span>)</span><span>;</span> +<span>}</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>The <code>"no-cors"</code> mode captures what the web platform does by default @@ -218,31 +218,31 @@ fetch<span style="color: #009900;">(</span>arbitraryUrl<span style="color: #3399 you could get a list of Flickr’s <a href="https://www.flickr.com/services/api/flickr.interestingness.getList.html">most interesting</a> photos today like this:</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> u <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> URLSearchParams<span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -u.<span style="color: #660066;">append</span><span style="color: #009900;">(</span><span style="color: #3366CC;">'method'</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">'flickr.interestingness.getList'</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -u.<span style="color: #660066;">append</span><span style="color: #009900;">(</span><span style="color: #3366CC;">'api_key'</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">'<insert api key here>'</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -u.<span style="color: #660066;">append</span><span style="color: #009900;">(</span><span style="color: #3366CC;">'format'</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">'json'</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -u.<span style="color: #660066;">append</span><span style="color: #009900;">(</span><span style="color: #3366CC;">'nojsoncallback'</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">'1'</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> u <span>=</span> <span>new</span> URLSearchParams<span>(</span><span>)</span><span>;</span> +u.<span>append</span><span>(</span><span>'method'</span><span>,</span> <span>'flickr.interestingness.getList'</span><span>)</span><span>;</span> +u.<span>append</span><span>(</span><span>'api_key'</span><span>,</span> <span>'<insert api key here>'</span><span>)</span><span>;</span> +u.<span>append</span><span>(</span><span>'format'</span><span>,</span> <span>'json'</span><span>)</span><span>;</span> +u.<span>append</span><span>(</span><span>'nojsoncallback'</span><span>,</span> <span>'1'</span><span>)</span><span>;</span> -<span style="color: #000066; font-weight: bold;">var</span> apiCall <span style="color: #339933;">=</span> fetch<span style="color: #009900;">(</span><span style="color: #3366CC;">'https://api.flickr.com/services/rest?'</span> <span style="color: #339933;">+</span> u<span style="color: #009900;">)</span><span style="color: #339933;">;</span> +<span>var</span> apiCall <span>=</span> fetch<span>(</span><span>'https://api.flickr.com/services/rest?'</span> <span>+</span> u<span>)</span><span>;</span> -apiCall.<span style="color: #660066;">then</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>response<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - <span style="color: #000066; font-weight: bold;">return</span> response.<span style="color: #660066;">json</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span>.<span style="color: #660066;">then</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>json<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - <span style="color: #006600; font-style: italic;">// photo is a list of photos.</span> - <span style="color: #000066; font-weight: bold;">return</span> json.<span style="color: #660066;">photos</span>.<span style="color: #660066;">photo</span><span style="color: #339933;">;</span> - <span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span>.<span style="color: #660066;">then</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>photos<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - photos.<span style="color: #660066;">forEach</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>photo<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>photo.<span style="color: #660066;">title</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> - <span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> +apiCall.<span>then</span><span>(</span><span>function</span><span>(</span>response<span>)</span> <span>{</span> + <span>return</span> response.<span>json</span><span>(</span><span>)</span>.<span>then</span><span>(</span><span>function</span><span>(</span>json<span>)</span> <span>{</span> + <span>// photo is a list of photos.</span> + <span>return</span> json.<span>photos</span>.<span>photo</span><span>;</span> + <span>}</span><span>)</span><span>;</span> +<span>}</span><span>)</span>.<span>then</span><span>(</span><span>function</span><span>(</span>photos<span>)</span> <span>{</span> + photos.<span>forEach</span><span>(</span><span>function</span><span>(</span>photo<span>)</span> <span>{</span> + console.<span>log</span><span>(</span>photo.<span>title</span><span>)</span><span>;</span> + <span>}</span><span>)</span><span>;</span> +<span>}</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>You may not read out the “Date” header since Flickr does not allow it via <br></br><code>Access-Control-Expose-Headers</code>.</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;">response.<span style="color: #660066;">headers</span>.<span style="color: #000066; font-weight: bold;">get</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Date"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// null</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript">response.<span>headers</span>.<span>get</span><span>(</span><span>"Date"</span><span>)</span><span>;</span> <span>// null</span></pre> </td> </tr></tbody></table></div> <p>The <code>credentials</code> enumeration determines if cookies for the other @@ -297,11 +297,11 @@ apiCall.<span style="color: #660066;">then</span><span style="color: #009900;">( <br></br>idiomatic way to return a Response to an intercepted request in ServiceWorkers is:</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;">addEventListener<span style="color: #009900;">(</span><span style="color: #3366CC;">'fetch'</span><span style="color: #339933;">,</span> <span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>event<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - event.<span style="color: #660066;">respondWith</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">new</span> Response<span style="color: #009900;">(</span><span style="color: #3366CC;">"Response body"</span><span style="color: #339933;">,</span> <span style="color: #009900;">{</span> - headers<span style="color: #339933;">:</span> <span style="color: #009900;">{</span> <span style="color: #3366CC;">"Content-Type"</span> <span style="color: #339933;">:</span> <span style="color: #3366CC;">"text/plain"</span> <span style="color: #009900;">}</span> - <span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript">addEventListener<span>(</span><span>'fetch'</span><span>,</span> <span>function</span><span>(</span>event<span>)</span> <span>{</span> + event.<span>respondWith</span><span>(</span><span>new</span> Response<span>(</span><span>"Response body"</span><span>,</span> <span>{</span> + headers<span>:</span> <span>{</span> <span>"Content-Type"</span> <span>:</span> <span>"text/plain"</span> <span>}</span> + <span>}</span><span>)</span><span>;</span> +<span>}</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>As you can see, Response has a two argument constructor, where both arguments @@ -348,17 +348,17 @@ apiCall.<span style="color: #660066;">then</span><span style="color: #009900;">( non-text data!</p> <p>Request bodies can be set by passing <code>body</code> parameters:</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> form <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> FormData<span style="color: #009900;">(</span>document.<span style="color: #660066;">getElementById</span><span style="color: #009900;">(</span><span style="color: #3366CC;">'login-form'</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -fetch<span style="color: #009900;">(</span><span style="color: #3366CC;">"/login"</span><span style="color: #339933;">,</span> <span style="color: #009900;">{</span> - method<span style="color: #339933;">:</span> <span style="color: #3366CC;">"POST"</span><span style="color: #339933;">,</span> - body<span style="color: #339933;">:</span> form -<span style="color: #009900;">}</span><span style="color: #009900;">)</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> form <span>=</span> <span>new</span> FormData<span>(</span>document.<span>getElementById</span><span>(</span><span>'login-form'</span><span>)</span><span>)</span><span>;</span> +fetch<span>(</span><span>"/login"</span><span>,</span> <span>{</span> + method<span>:</span> <span>"POST"</span><span>,</span> + body<span>:</span> form +<span>}</span><span>)</span></pre> </td> </tr></tbody></table></div> <p>Responses take the first argument as the body.</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> res <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> Response<span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">new</span> File<span style="color: #009900;">(</span><span style="color: #009900;">[</span><span style="color: #3366CC;">"chunk"</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">"chunk"</span><span style="color: #009900;">]</span><span style="color: #339933;">,</span> <span style="color: #3366CC;">"archive.zip"</span><span style="color: #339933;">,</span> - <span style="color: #009900;">{</span> type<span style="color: #339933;">:</span> <span style="color: #3366CC;">"application/zip"</span> <span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> res <span>=</span> <span>new</span> Response<span>(</span><span>new</span> File<span>(</span><span>[</span><span>"chunk"</span><span>,</span> <span>"chunk"</span><span>]</span><span>,</span> <span>"archive.zip"</span><span>,</span> + <span>{</span> type<span>:</span> <span>"application/zip"</span> <span>}</span><span>)</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>Both Request and Response (and by extension the <code>fetch()</code> function), @@ -372,16 +372,16 @@ fetch<span style="color: #009900;">(</span><span style="color: #3366CC;">"/login read once! Both interfaces have a boolean attribute <code>bodyUsed</code> to determine if it is safe to read or not.</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #000066; font-weight: bold;">var</span> res <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> Response<span style="color: #009900;">(</span><span style="color: #3366CC;">"one time use"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>res.<span style="color: #660066;">bodyUsed</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// false</span> -res.<span style="color: #660066;">text</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span>.<span style="color: #660066;">then</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>v<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>res.<span style="color: #660066;">bodyUsed</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// true</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>res.<span style="color: #660066;">bodyUsed</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// true</span> + <table><tbody><tr><td class="code"><pre class="javascript"><span>var</span> res <span>=</span> <span>new</span> Response<span>(</span><span>"one time use"</span><span>)</span><span>;</span> +console.<span>log</span><span>(</span>res.<span>bodyUsed</span><span>)</span><span>;</span> <span>// false</span> +res.<span>text</span><span>(</span><span>)</span>.<span>then</span><span>(</span><span>function</span><span>(</span>v<span>)</span> <span>{</span> + console.<span>log</span><span>(</span>res.<span>bodyUsed</span><span>)</span><span>;</span> <span>// true</span> +<span>}</span><span>)</span><span>;</span> +console.<span>log</span><span>(</span>res.<span>bodyUsed</span><span>)</span><span>;</span> <span>// true</span> -res.<span style="color: #660066;">text</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span>.<span style="color: #000066; font-weight: bold;">catch</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>e<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span><span style="color: #3366CC;">"Tried to read already consumed Response"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> +res.<span>text</span><span>(</span><span>)</span>.<span>catch</span><span>(</span><span>function</span><span>(</span>e<span>)</span> <span>{</span> + console.<span>log</span><span>(</span><span>"Tried to read already consumed Response"</span><span>)</span><span>;</span> +<span>}</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> <p>This decision allows easing the transition to an eventual <a href="https://streams.spec.whatwg.org/">stream-based</a> Fetch @@ -398,20 +398,20 @@ res.<span style="color: #660066;">text</span><span style="color: #009900;">(</sp be called before the body of the corresponding object has been used. That is, <code>clone()</code> first, read later.</p> <div class="wp_syntax"> - <table><tbody><tr><td class="code"><pre class="javascript" style="font-family:monospace;">addEventListener<span style="color: #009900;">(</span><span style="color: #3366CC;">'fetch'</span><span style="color: #339933;">,</span> <span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>evt<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - <span style="color: #000066; font-weight: bold;">var</span> sheep <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">new</span> Response<span style="color: #009900;">(</span><span style="color: #3366CC;">"Dolly"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>sheep.<span style="color: #660066;">bodyUsed</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// false</span> - <span style="color: #000066; font-weight: bold;">var</span> clone <span style="color: #339933;">=</span> sheep.<span style="color: #660066;">clone</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>clone.<span style="color: #660066;">bodyUsed</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// false</span> + <table><tbody><tr><td class="code"><pre class="javascript">addEventListener<span>(</span><span>'fetch'</span><span>,</span> <span>function</span><span>(</span>evt<span>)</span> <span>{</span> + <span>var</span> sheep <span>=</span> <span>new</span> Response<span>(</span><span>"Dolly"</span><span>)</span><span>;</span> + console.<span>log</span><span>(</span>sheep.<span>bodyUsed</span><span>)</span><span>;</span> <span>// false</span> + <span>var</span> clone <span>=</span> sheep.<span>clone</span><span>(</span><span>)</span><span>;</span> + console.<span>log</span><span>(</span>clone.<span>bodyUsed</span><span>)</span><span>;</span> <span>// false</span> - clone.<span style="color: #660066;">text</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>sheep.<span style="color: #660066;">bodyUsed</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// false</span> - console.<span style="color: #660066;">log</span><span style="color: #009900;">(</span>clone.<span style="color: #660066;">bodyUsed</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #006600; font-style: italic;">// true</span> + clone.<span>text</span><span>(</span><span>)</span><span>;</span> + console.<span>log</span><span>(</span>sheep.<span>bodyUsed</span><span>)</span><span>;</span> <span>// false</span> + console.<span>log</span><span>(</span>clone.<span>bodyUsed</span><span>)</span><span>;</span> <span>// true</span> - evt.<span style="color: #660066;">respondWith</span><span style="color: #009900;">(</span>cache.<span style="color: #660066;">add</span><span style="color: #009900;">(</span>sheep.<span style="color: #660066;">clone</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span>.<span style="color: #660066;">then</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">function</span><span style="color: #009900;">(</span>e<span style="color: #009900;">)</span> <span style="color: #009900;">{</span> - <span style="color: #000066; font-weight: bold;">return</span> sheep<span style="color: #339933;">;</span> - <span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> -<span style="color: #009900;">}</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span></pre> + evt.<span>respondWith</span><span>(</span>cache.<span>add</span><span>(</span>sheep.<span>clone</span><span>(</span><span>)</span><span>)</span>.<span>then</span><span>(</span><span>function</span><span>(</span>e<span>)</span> <span>{</span> + <span>return</span> sheep<span>;</span> + <span>}</span><span>)</span><span>;</span> +<span>}</span><span>)</span><span>;</span></pre> </td> </tr></tbody></table></div> @@ -429,4 +429,4 @@ res.<span style="color: #660066;">text</span><span style="color: #009900;">(</sp <p><em>The author would like to thank Andrea Marchesini, Anne van Kesteren and Ben<br></br> Kelly for helping with the specification and implementation.</em> </p> - </article>
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