If you are working with Eclipse and using SVN connector to checkout SVN projects through proxy, you may got error messages like "RA layer request failed svn: OPTIONS..." It happens because SVN connector doesn't use Eclipse proxy setting. If you have configured proxy setting on Eclipse Preferences, it doesn't make SVN connector to work.
Eclipse subversion plugin use some configuration files which are located in "C:/Users/<username>/AppData/Roaming/Subversion" (Windows 8) or other similar locations on other Windows versions. You need to changes servers file. AppData folder could be in hidden state, so you should make it showed.
|show hidden folder|
Open servers file using text editor like Notepad.
|open servers file|
Find [global] tag, and change proxy setting below it.
|configure proxy setting|
Hope it can be useful for you.