diff --git a/http_client.rst b/http_client.rst
index 32ef552c64f..3d4f7d98c44 100644
--- a/http_client.rst
+++ b/http_client.rst
@@ -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,
+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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