As explained on the flair page:
to change the theme, add
?theme=hotdogto the end of the image URL
The majority of the time, this works fine. However, I wanted to add my flair to my signature on a PHPBB2 forum. I can't find the documentation on it at the moment, but I could have sworn that I read that BBCode image tags are only converted to HTML image tags when the image URL "appears to be an image URL." Meaning, a flair URL of
http://stackexchange.com/users/flair/HASH.png is valid, but
http://stackexchange.com/users/flair/HASH.png?theme=clean is not valid because their parser no longer considers it to be an image URL.
I also tried
http://stackexchange.com/users/flair/HASH.png?theme=clean&x=.png but I guess it was smart enough to detect that arguments were being used, still.
Granted it's not a huge deal that I'm stuck on the default theme, but the best fix for my situation would probably be to set up the URL handling such that I can do
http://stackexchange.com/users/flair/themes/clean/HASH.png to keep a "true" image URL.
Failing that, does anyone know of a workaround for this issue on PHPBB forums?
Also, as a minor rider/request to this question, offering pre-made BBCode for the flair on the flair page would have saved me a minute.