response.write，但对于具有正确内容类型的文件？

Question

Is there a way to return a file (ex. images, scripts) with correct content type with response.write ? This is what I have been using:

with open(path) as f:
    self.response.write(f.read())

but this sets the content type as text/html . Or is response.write not the correct way to approach this?

Answer 1

I found an example using mimetypes in the Webob documentation (webapp2 requests and responses are Webob Request/Response objects ). Documentation on mimetypes can be found here . mimetypes is a built-in python module mapping file extensions to MIME type.

The example I found includes this function:

import mimetypes
def get_mimetype(filename):
    type, encoding = mimetypes.guess_type(filename)
    # We'll ignore encoding, even though we shouldn't really
    return type or 'application/octet-stream'

You can use that function in your handler like so:

def FileHandler(webapp2.RequestHandler):
    # I'm going to assume `path` is a route arg
    def get(self, path):
        # set content_type
        self.response.content_type = get_mimetype(path)
        with open(path) as f:
             self.response.write(f.read())

Note: using python-magic instead of mimetypes would work as well and might be worth looking into, as @Dan Cornilescu pointed out. He linked to this SO answer .

Answer 2

Try adding the content type to the header:

my_file = f.read()
content_type = my_file.headers.get('Content-Type', 'text/html')

self.response.headers.add_header("Content-Type",content_type)
self.response.write(my_file)