Checklist

• I have verified that that issue exists against the master branch of Django REST framework.
• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• This is not a usage question. (Those should be directed to the discussion group instead.)
• This cannot be dealt with as a third party library. (We prefer new functionality to be in the form of third party libraries where possible.)
• I have reduced the issue to the simplest possible case.
• I have included a failing test as a pull request. (If you are unable to do so we can still accept the issue.)

Steps to reproduce

Implement the documentation example of SwaggerRenderer at: https://github.com/tomchristie/django-rest-framework/blame/master/docs/api-guide/schemas.md#L244

And try to get an HTTP request to an endpoint that uses this renderer:

http http://127.0.0.1:8000/v1/ Accept:application/openapi+json;version=2.0

Expected behavior

Get a JSON with Swagger API Schema.

Actual behavior

Get an HTTP 406:

HTTP/1.0 406 Not Acceptable
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Date: Tue, 19 Jul 2016 19:51:47 GMT
Server: WSGIServer/0.2 CPython/3.5.1+
Vary: Accept
X-Frame-Options: SAMEORIGIN

{
    "detail": "Could not satisfy the request Accept header."
}

Preliminar analisys

I've found that media_type doesn't match "version" parameter correctly in the following lines (even with */*; q=0.8 media type):

• https://github.com/tomchristie/django-rest-framework/blob/master/rest_framework/negotiation.py#L58
• https://github.com/tomchristie/django-rest-framework/blob/master/rest_framework/utils/mediatypes.py#L61