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[HttpClient] Adding DataPart to manually set the Content-Type #20960

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[HttpClient] Adding DataPart to manually set the Content-Type #20960

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[Form] Adding `DataPart` to manually set the `Content-Type`
ThomasLandauer May 13, 2025
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Update http_client.rst
ThomasLandauer May 13, 2025
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[Form] Adding DataPart to manually set the Content-Type 
Page: https://symfony.com/doc/6.4/http_client.html#uploading-data
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@ThomasLandauer
ThomasLandauer authored May 13, 2025
commit aa84c7d4673f5523f135ebbf4b34f04172edae3f
9 changes: 9 additions & 0 deletions 9 http_client.rst
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Expand Up @@ -665,6 +665,15 @@
$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,
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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.

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When is not detected?

Actually, I'm not sure if it's actually detected 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.

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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')]
];

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[PHP syntax] Syntax error, unexpected ';', expecting ')'

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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