May 13, 2025 · May 13, 2025 · May 14, 2025 · May 14, 2025 · May 19, 2025
diff --git a/http_client.rst b/http_client.rst
        $formData->getParts(); // Returns two instances of TextPart both
                               // with the name "array_field"

 Usually, the ``Content-Type`` of each form's part is detected automatically. However,
 you can override it by passing a ``DataPart``::

    use Symfony\Component\Mime\Part\DataPart;

    $formData = new FormDataPart([
        ['json_data' => new DataPart(json_encode($json), null, 'application/json')]
    ]);

 By default, HttpClient streams the body contents when uploading them. This might
 not work with all servers, resulting in HTTP status code 411 ("Length Required")
 because there is no ``Content-Length`` header. The solution is to turn the body
Original file line number	Diff line number	Diff line change
Expand Up		@@ -665,6 +665,15 @@ of the opened file, but you can configure both with the PHP streaming configurat
		$formData->getParts(); // Returns two instances of TextPart both
		// with the name "array_field"

		Usually, the ``Content-Type`` of each form's part is detected automatically. However,
Copy link Member javiereguiluzMay 14, 2025 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others.Learn more. Asking because I don't know much about this. When you say this: `Usually the content type [...] is detected automatically.` When is not detected? I want to better understand the scenarios where the reader needs to use this explicit content type definition. Thanks. Copy link ContributorAuthor ThomasLandauerMay 14, 2025 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others.Learn more. When is not detected? Actually, I'm not sure if it's actuallydetected at all ;-) I just had the requirement to post to an external API as`multipart/form-data`, but with one of those parts being JSON (`application/json`), and this here was the way to make it work. Copy link Member javiereguiluzMay 19, 2025 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others.Learn more. If you have some time to dig into this, could you please check the exact code behavior so we can updat the documentation accordingly? Thanks a lot!
		you can override it by passing a ``DataPart``::

		use Symfony\Component\Mime\Part\DataPart;

		$formData = new FormDataPart([
		['json_data' => new DataPart(json_encode($json), null, 'application/json')]
		]);

		By default, HttpClient streams the body contents when uploading them. This might
		not work with all servers, resulting in HTTP status code 411 ("Length Required")
		because there is no ``Content-Length`` header. The solution is to turn the body
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