proxy_support.md: Documentation for proxy support

proxy_support.md

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+HTTP proxy support for geeknote
+===============================
+
+I recommend to make this work with virtualenv, to avoid overwriting system files.
+The important part is to install in the order **thrift, then evernote, then geeknote**. This will make sure that path search order is correct for thrift.
+
+```
+# Download thrift and geeknote
+git clone https://github.com/apache/thrift.git
+git clone https://github.com/mwilck/geeknote.git
+
+# create and enter a virtual environment
+virtualenv /var/tmp/geeknote
+. /var/tmp/geeknote/bin/activate
+
+# Apply proxy-support patches for thrift
+cd thrift
+
+## If the patches don't apply, you may need to check out the state that I wrote the patches for:
+## git checkout -b proxy e363a34e63
+curl https://issues.apache.org/jira/secure/attachment/12801233/0001-python-THttpClient-Add-support-for-system-proxy-sett.patch | git am
+curl https://issues.apache.org/jira/secure/attachment/12801234/0002-Python-THttpClient-Support-proxy-authorization.patch | git am
+
+# Install thrift from the patched tree
+(cd lib/py; python setup.py install)
+cd ..
+
+# Install evernote
+pip install evernote
+
+# Install geeknote
+cd geeknote
+python setup.py install
+```
+
+Now `geeknote login`, `geeknote find`, etc. should work behind a proxy if the `http_proxy` environment variable is correctly set. You can now generate a script to activate the virtual environment:
+
+```
+cat >~/bin/geeknote <<\EOF
+#! /bin/bash
+. /var/tmp/geeknote/bin/activate
+exec geeknote "$@"
+EOF
+chmod a+x ~/bin/geeknote
+```