v0.4.3 2017-10-19 19:53 UTC


Emits a Response to the PHP Server API.

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Two implementations currently available: Narrowspark\HttpEmitter\SapiEmitter and Narrowspark\HttpEmitter\SapiStreamEmitter. Each use the native PHP functions header() and echo in order to emit the response.

If you are using a non-SAPI implementation, you will need to create your own Narrowspark\HttpEmitter\EmitterInterface implementation.

Note: If headers have been sent, or the output buffer exists and has a non-zero length, the emitters raise an exception, as mixed PSR-7 / output buffer content creates a blocking issue.

If you are emitting content via echo, print, var_dump, etc., or not catching PHP errors / exceptions, you will need to either fix your application to always work with a PSR-7 response. Or provide your own emitters that allow mixed output mechanisms.


composer require narrowspark/http-emitter



use Narrowspark\HttpEmitter\SapiEmitter;

$response = new \Response();
$response->getBody()->write("some content\n");

$emitter = new SapiEmitter();

If you missing the Content-Length header you need to use


$response = new \Response();

$response = Util::injectContentLength($response);


If you would like to help take a look at the list of issues and check our Contributing guild.

Note: Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.


The Narrowspark http-emitter is open-sourced software licensed under the MIT license