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Malformed header causes IndexError during header parsing

See original GitHub issue

This response (note the space and quotes around Content-type):

$ curl --head https://consumersentinel.gov
HTTP/1.0 200 OK
 "Content-type": text/html
pragma: no-cache
retry-after: 600
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
Server: BigIP
Connection: Keep-Alive
Content-Length: 2835

Causes this error in urllib3:

  File "/home/eric/.pyenv/versions/2.7.11/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py", line 590, in urlopen
    **response_kw)
  File "/home/eric/.pyenv/versions/2.7.11/lib/python2.7/site-packages/requests/packages/urllib3/response.py", line 373, in from_httplib
    headers = HTTPHeaderDict.from_httplib(headers)
  File "/home/eric/.pyenv/versions/2.7.11/lib/python2.7/site-packages/requests/packages/urllib3/_collections.py", line 317, in from_httplib
    key, value = headers[-1]
IndexError: list index out of range

I’m using urllib3 via requests, but it doesn’t look like that’s causing the issue.

Issue Analytics

State:
Created 7 years ago
Comments:9 (5 by maintainers)

Top GitHub Comments

2reactions

Lukasacommented, Aug 18, 2016

What the hell is that monstrous header? Whomever is operating that web server needs a very stern telling off, because that output isn’t even close to acceptable.

Regardless, good debugging folks!

2reactions

haikugingercommented, Aug 18, 2016

Actually, not a difference in the parsing - found the issue, and will have a PR shortly.

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