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Content-type for Pylons Static Content February 6, 2008

Posted by PythonGuy in Pylons, Web Technologies.

So I was playing with my shiny new Firefox3 beta 2. I was admiring the wonderful features of the canvas object. And I started to want to really get into SVG.

Well, I ran into a problem. My pylons server wasn’t serving SVG files as SVG files.

I put “test.svg” into my project’s “public” directory. I browsed to the URL http://localhost:5000/test.svg . I noticed that Firefox didn’t recognize the file and asked me to open another app to render it. (eog is nice, and it does a terrific job rendering it, but I wanted to have Firefox do the hard work this time around.)

Just to be sure that Firefox could render the file, I browsed to the absolute path on my local hard drive. That is, “file://home/pythonguy/MyProject/myproject/public/test.svg” Sure enough, it renders fine.

What else to do? Well, I realize by reading the FAQ on SVG for Firefox that if the server doesn’t send the correct Content-type response, then Firefox won’t guess. Sure enough, this telnet session showed me what my server was saying:

$ telnet localhost 5000
GET /test.svg HTTP/1.0

HTTP/1.0 200 OK
Server: PasteWSGIServer/0.5 Python/2.5.1
Date: Wed, 06 Feb 2008 03:24:32 GMT
content-type: application/octet-stream

So there’s the problem. My Pylons server doesn’t recognize the .svg ending on the file.

Digging deeper, I found this part in “config/middleware.py”:

    # Static files
    javascripts_app = StaticJavascripts()
    static_app = StaticURLParser(config['pylons.paths']['static_files'])
    app = Cascade([static_app, javascripts_app, app])
    return app

Well, this certainly is interesting. The “Cascade” object lives in “paste/cascade.py”. All it does is try out the different apps until it gets one that doesn’t give an error response. The “StaticURLParser” object is the one that serves the static files.

Looking in “paste/urlparser.py” (thank goodness for explicit imports in Python!), I found a reference to “FileApp” in “paste/fileapp.py”. There, I see that the mime type is determined by the mimetypes module, part of the standard packages for Python.

Poking around mimetypes, I am not surprised to see that files ending in “.svg” are not recognized. (I am surprised, very happily surprised, that Pylons doesn’t try to redesign the wheel when it comes to MIME types.) Reading the documentation, it points out where it learns which file names represent which MIME types. On my system, that is “/etc/mime.types”.

Sure enough, SVG is missing from the list of MIME types in /etc/mime.types. Maybe it is out of date? (Unlikely, but possible.) Nope, it turns out that SVG isn’t registered yet as a valid MIME type.

I hand-edited the file to recognize SVG. Telnet now gives me:

$ telnet localhost 5000
GET /test.svg HTTP/1.0

HTTP/1.0 200 OK
Server: PasteWSGIServer/0.5 Python/2.5.1
Date: Wed, 06 Feb 2008 03:24:32 GMT
content-type: image/svg+xml

But Firefox still doesn’t recognize it. Nuts.



1. Tuvshinbayar.CH - June 12, 2008

> > > > This is my code snippet. This code will not read the characters
> > in
> > > > Ms Word Document. I got the below output. But if i use any *txt*
> > > > format this will be display properly. Instead of txt format i am
> > > > using doc format. I got error while ptinting. I don’t understand content. please help me to
> >
> > > > this problem
> > > >
> > > >
> > > > import win32com.client

doc = win32com.client.Dispatch(‘Word.Application’)
text = doc.ActiveDocument.content.text

text = text.encode(‘Latin-1’)

print text

> > > > *Output :*
> > > >Traceback (most recent call last):
File “C:\Python25\JISHEE\printdoc.py”, line 5, in
text = doc.ActiveDocument.content.text
File “C:\Python25\Lib\site-packages\win32com\client\__init__.py”, line 496, in __getattr__
if d is not None: return getattr(d, attr)
File “C:\Python25\Lib\site-packages\win32com\client\__init__.py”, line 454, in __getattr__
raise AttributeError, “‘%s’ object has no attribute ‘%s'” % (repr(self), attr)
AttributeError: ” object has no attribute ‘content’
> > > >
> > > > Tuvshinbayar.CH

2. Victor Olex - August 12, 2011

Thank’s for the digging. If you have not access to mime.types file another option is to add the missing type like so:

import mimetypes

I find middleware.py a convenient place for this.

3. Python:Can the Django dev server correctly serve SVG? – IT Sprite - September 26, 2015

[…] also this blog post specific to Pylons but it mentions a similar issue. He specifies that the MIME types are stored in […]

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