PHP development server does not support Expect 100-continue flow control

[Sjord]

Description

The server provided by php -S does not work optimally when posting large files to it with curl.

https://everything.curl.dev/http/post/expect100.html

Curl waits one second for a 100 Continue response, but the PHP server does not send it. This means that the PHP server introduces a one second delay on such requests.

[Sjord]

If I read https://www.rfc-editor.org/rfc/rfc9110.html#name-expect correctly, this is required to be implemented for servers:

Upon receiving an HTTP/1.1 (or later) request that has a method, target URI, and complete header section that contains a 100-continue expectation and an indication that request content will follow, an origin server MUST send either:

• an immediate response with a final status code, if that status can be determined by examining just the method, target URI, and header fields, or
• an immediate 100 (Continue) response to encourage the client to send the request content.

So perhaps this is more a bug than a feature request.

Ping @iluuu1994

[iluuu1994]

The docs do have some words on this:

https://www.php.net/manual/en/features.commandline.webserver.php

It may also be useful for testing purposes or for application demonstrations that are run in controlled environments. It is not intended to be a full-featured web server.

No objections to adding support for this, but I think this should be treated as a feature request.