#33230: Test client doesn't set explicitly provided Content-Type when data is
empty
-------------------------------------+-------------------------------------
Reporter: Markus Holtermann | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Testing framework | Version: 3.2
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by Anders Kaseorg):
* status: closed => new
* resolution: wontfix =>
Comment:
Reopening with two arguments, one theoretical and one practical.
The test client currently omits both `Content-Length` and `Content-Type`
for an empty `PATCH`/`POST`/`PUT` body. But RFC 9110 is [https://www.rfc-
editor.org/rfc/rfc9110#section-8.6-5 explicitly clear] that `Content-
Length` is expected here: “A user agent SHOULD send Content-Length in a
request when the method defines a meaning for enclosed content and it is
not sending Transfer-Encoding. For example, a user agent normally sends
Content-Length in a POST request even when the value is 0 (indicating
empty content). A user agent SHOULD NOT send a Content-Length header field
when the request message does not contain content and the method semantics
do not anticipate such data.”
Although the expectation for `Content-Type` is potentially more open to
interpretation (“A sender that generates a message containing content
SHOULD generate a Content-Type header field…”), including it is the only
way to inform the server how to decode the empty body; for example, an
empty `application/x-www-form-urlencoded` body is valid while an empty
`application/json` body is not.
As a practical application, this is required for validating requests
against an OpenAPI document: the `Content-Type` is needed to
[https://spec.openapis.org/oas/v3.1.0#requestBodyObject index into the
map] that declares the body’s schema and encoding.
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Ticket URL: <https://code.djangoproject.com/ticket/33230#comment:4>
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