PUT request for image upload not working in django rest

Question

I am trying to upload an image in django rest using multipart/form-data in a PUT request and Pillow:

class ABC(APIView):
    parser_classes = (MultiPartParser,)
    def put(self, request):
        a = Image()
        a.image_url = request.data["image"]
        a.save()

class Image(models.Model):
      image_url = models.ImageField(upload_to='static/bills', blank=True)

I make a request which is a PUT request and a multipart/form-data. I end up getting a response code of 400 with the message:

{
  "detail": "Multipart form parse error - Invalid boundary in multipart: None"
}

Somehow this has broken just now. It was working fine when I wrote it the first time. Since then I have added few settings configuration for CORS requests like:

CORS_ORIGIN_ALLOW_ALL = True

CORS_ALLOW_HEADERS = (
    'x-requested-with',
    'content-type',
    'accept',
    'origin',
    'authorization',
    'x-csrftoken',
    'token',
    'x-device-id',
    'x-device-type',
    'x-push-id',
    'dataserviceversion',
    'maxdataserviceversion'
)
CORS_ALLOW_METHODS = (
        'GET',
        'POST',
        'PUT',
        'PATCH',
        'DELETE',
        'OPTIONS'
    )

Any ideas?

OPTIONS Request response:

Access-Control-Allow-Headers → x-requested-with, content-type, accept, origin, authorization, x-csrftoken, token, x-device-id, x-device-type, x-push-id, dataserviceversion, maxdataserviceversion
    Access-Control-Allow-Methods → GET, POST, PUT, PATCH, DELETE, OPTIONS
    Access-Control-Allow-Origin → *
    Access-Control-Max-Age → 86400
    Allow → GET, POST, DELETE, HEAD, OPTIONS
    Content-Type → application/json
    Date → Fri, 21 Aug 2015 06:23:28 GMT
    Server → WSGIServer/0.1 Python/2.7.6
    Vary → Accept
    X-Frame-Options → SAMEORIGIN

Answer 1

从标头中删除内容类型可解决此问题。

Answer 2

Your error is telling you that the boundary for your multipart/form-data content of your request is invalid - in particular that is is None . This, by design, returns a 400 ("Bad Request") response code. The Error is raised here in the django code .

To enter that code branch with boundary equal to None means that the boundary option is not specified in the content-type header of your request.

boundary must be specified when using multipart/form-data in content-type as specified in RFC2046 (referred to by RFC2388 ) - in particular section 5.1.1

The Content-Type field for multipart entities requires one parameter, "boundary".

You say it has worked before, so you should check the code that you are using to make the request - something must have changed to mean that the boundary is not specified in the content-type .

NB I presume the request is code-generated, as <form method="put"> is invalid HTML and so a request generated by a browser given that HTML would be a GET rather than a PUT .

Answer 3

您通常希望同时使用FormParser和MultiPartParser，以便完全支持HTML表单数据。