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<?php
declare(strict_types=1);
namespace OpenTracing\Formats;
/**
* Used a (single) arbitrary binary blob representing a SpanContext
*
* For both Tracer::inject() and Tracer::extract() the carrier must be a `string`.
*/
const BINARY = 'binary';
/**
* Used for an arbitrary string-to-string map with an unrestricted character set for both keys and values
*
* Unlike `HTTP_HEADERS`, the `TEXT_MAP` format does not restrict the key or
* value character sets in any way.
*
* For both Tracer::inject() and Tracer::extract() the carrier must be a `array|ArrayObject`.
*/
const TEXT_MAP = 'text_map';
/**
* Used for a string-to-string map with keys and values that are suitable for use in HTTP headers (a la RFC 7230.
* In practice, since there is such "diversity" in the way that HTTP headers are treated in the wild, it is strongly
* recommended that Tracer implementations use a limited HTTP header key space and escape values conservatively.
*
* Unlike `TEXT_MAP`, the `HTTP_HEADERS` format requires that the keys and values be valid as HTTP headers as-is
* (i.e., character casing may be unstable and special characters are disallowed in keys, values should be
* URL-escaped, etc).
*
* For both Tracer::inject() and Tracer::extract() the carrier must be a `array|ArrayObject`.
*
* For example, Tracer::inject():
*
* $headers = []
* $tracer->inject($span->getContext(), Formats\HTTP_HEADERS, $headers)
* $request = new GuzzleHttp\Psr7\Request($uri, $body, $headers);
*
* Or Tracer::extract():
*
* $headers = $request->getHeaders()
* $clientContext = $tracer->extract(Formats\HTTP_HEADERS, $headers)
*
* @see http://www.php-fig.org/psr/psr-7/#12-http-headers
* @see http://php.net/manual/en/function.getallheaders.php
*/
const HTTP_HEADERS = 'http_headers';
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