This PR was merged into the 4.4 branch. Discussion ---------- [HttpClient] Handle requests with null body | Q | A | ------------- | --- | Branch? | 4.4 | Bug fix? | yes | New feature? | no | Deprecations? | no | Tickets | / | License | MIT | Doc PR | / since #45527 passing null to the `body` parameters leads to an exception (which [breaks async-aws](https://github.com/async-aws/aws/blob/09723ddca29b8d1d522426f81dd422373de1785f/src/Core/src/AbstractApi.php#L157)) > Argument #2 ($body) must be of type Closure, null given, called in /home/runner/work/aws/aws/vendor/symfony/http-client/CurlHttpClient.php on line 221 In curl client: `null` is not a string and `self::readRequestBody` expects a closure. https://github.com/symfony/symfony/blob/08fa74a16c84895575e305b2a7ee3a03e371f79b/src/Symfony/Component/HttpClient/CurlHttpClient.php#L214-L221 In NativeClient, `getBodyAsString` will fail to return `null` because of the `string` return type. Before #45527 null was converted to `""` thanks to the defaultOptions, but this is not the case anymore. In many places, we check if the body is `!== ""` but rarely check if the body is null, this PR restores the original behaviors for the `body` parameters and converts nulls to `""`. Commits ------- 39aec09 [HttpClient] Handle requests with null body

Uh oh!