Very useful Rated 5 out of 5 stars
I just discovered Header Tool today and found it extremely convenient to use. There could be some enhancements (like for examples access to other header and maybe form data) but in its current form it is much more useful than Modify Headers, which I used before.
Best thing is the possibility to set headers based on the URL accessed, which Modify Headers does not offer.
I really appreciate your comment and if you have comment on how improve it just let me know on support site : code.google.com/p/headertool/