[9.x] Skip parameter parsing for raw post body in HTTP Client

[Krisell]

Fixes #42349
Related to #36976

When sending an Http::withBody() using the Http client, the raw body is parsed as query/form parameters. This seems wrong and is both unnecessary work and risks hitting the default limit of 1000 "input variables" in php.

Http::withBody(str_repeat('A thousand &. ', 1000), 'text/plain')->post('https://some-url.com');

ErrorException

parse_str(): Input variables exceeded 1000. To increase the limit change max_input_vars in php.ini.

The limit of 1000 is quite easily hit by sending HTML, XML or similar text.

The suggested solution here skips all parameter parsing of the body, also saving a fair bit of work. All tests pass, but is there a specific reason to parse the body this way, or might that have been introduced by mistake in order to parse query and form-data parameters?

Our use case is sending user-provided HTML to an external service (for text analysis) and while being very rare, we sometimes see the 1000 limit being hit via Bugsnag.

Thanks to @pelmered for suggestion of simplified flow (early return).

[driesvints]

Thanks @Krisell

[Kuzuto]

Please add this update to Laravel 8.x

[driesvints]

@Kuzuto 8.x isn't maintained anymore. Please upgrade to 9.x