I have a python CGI script that receives a POST request containing a specific HTTP header. How do you read and parse the headers received? I am not using BaseHTTPRequestHandler or HTTPServer. I receive the body of the post with sys.stdin.read(). Thanks.
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2 Answers
It is possible to get a custom request header's value in an apache CGI script with python. The solution is similar to this.
Apache's mod_cgi will set environment variables for each HTTP request header received, the variables set in this manner will all have an HTTP_ prefix, so for example x-client-version: 1.2.3 will be available as variable HTTP_X_CLIENT_VERSION.
So, to read the above custom header just call os.environ["HTTP_X_CLIENT_VERSION"].
The below script will print all HTTP_* headers and values:
#!/usr/bin/env python
import os
print "Content-Type: text/html"
print "Cache-Control: no-cache"
print
print "<html><body>"
for headername, headervalue in os.environ.iteritems():
if headername.startswith("HTTP_"):
print "<p>{0} = {1}</p>".format(headername, headervalue)
print "</html></body>"
Comments
You might want to look at the cgi module included with Python's standard library. It appears to have a cgi.parse_header(string) function that you might find to be helpful in trying to get the headers.
4 Comments
Alec Fenichel
cgi.parse_header('X-GitHub-Event') doesn't return the header. It doesn't return any header I have tried.
Noctis Skytower
@AlecFenichel I believe its purpose is to parse the headers after you have gotten them.
Alec Fenichel
Yes. But how do you get them?
pigeonburger
This does nothing. You can't parse a header if you haven't even gotten them.