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Update reverse proxy host header docs

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Ryan Laughlin 2016-09-26 12:37:17 -04:00 committed by Maximilian Hils
parent 1a762cdce5
commit e0f9aef89c
1 changed files with 9 additions and 24 deletions
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docs/features/reverseproxy.rst
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@ -29,29 +29,14 @@ them to what the server expects.
Host Header
-----------
In reverse proxy mode, mitmproxy does not rewrite the host header. While often useful, this
may lead to issues with public web servers. For example, consider the following scenario:
In reverse proxy mode, mitmproxy automatically rewrites the Host header to match the
upstream server. This allows mitmproxy to easily connect to existing endpoints on the
open web (e.g. ``mitmproxy -R https://example.com``).
.. code-block:: none
:emphasize-lines: 5
However, keep in mind that absolute URLs within the returned document or HTTP redirects will
NOT be rewritten by mitmproxy. This means that if you click on a link for "http://example.com"
in the returned web page, you will be taken directly to that URL, bypassing mitmproxy.
>>> mitmdump -d -R http://example.com/
>>> curl http://localhost:8080/
>> GET https://example.com/
Host: localhost:8080
User-Agent: curl/7.35.0
[...]
<< 404 Not Found 345B
Since the Host header doesn't match "example.com", an error is returned.
There are two ways to solve this:
1. Modify the hosts file of your OS so that "example.com" resolves to your proxy's IP.
Then, access example.com directly. Make sure that your proxy can still resolve the original IP
or specify an IP in mitmproxy.
2. Use mitmproxy's :ref:`setheaders` feature to rewrite the host header:
``--setheader :~q:Host:example.com``.
However, keep in mind that absolute URLs within the returned document or HTTP redirects will
cause the client application to bypass the proxy.
One possible way to address this is to modify the hosts file of your OS so that "example.com"
resolves to your proxy's IP, and then access the proxy by going directly to example.com.
Make sure that your proxy can still resolve the original IP, or specify an IP in mitmproxy.