How to set the content type header in response for a particular file type in Pyramid web framework

Question

I am using pyramid web framework to build a website. I keep getting this warning in chrome console:

Resource interpreted as Font but transferred with MIME type application/octet-stream: "http:static/images/fonts/font.woff".

How do I get rid of this warning message?

I have configured static files to be served using add_static_view

I can think of a way to do this by adding a subscriber function for responses that checks if the path ends in .woff and setting the response header to application/x-font-woff. But it does not look like a clean solution. Is there a way to tell Pyramid to do it through some setting.

Answer 1

Pyramid uses the standard mimetypes module to guess the mimetype based on the extension. It calls:

mimetypes.guess_type(path, strict=False)

The module looks in the Windows registry if on that platform, and in the following locations for mimetype lists:

knownfiles = [
    "/etc/mime.types",
    "/etc/httpd/mime.types",                    # Mac OS X
    "/etc/httpd/conf/mime.types",               # Apache
    "/etc/apache/mime.types",                   # Apache 1
    "/etc/apache2/mime.types",                  # Apache 2
    "/usr/local/etc/httpd/conf/mime.types",
    "/usr/local/lib/netscape/mime.types",
    "/usr/local/etc/httpd/conf/mime.types",     # Apache 1.2
    "/usr/local/etc/mime.types",                # Apache 1.3
    ]

You can either extend one of those files, or create your own file and add it to the module using the .init() function.

The file format is simple, just list the mimetype, then some whitespace, then a space-separated list of extensions:

application/x-font-woff     woff