I swapped web hosts a few weeks back. I struggled to get one of my apps to write to the server. Turns out a string in an sql field had “Select matches”. So long as "Select… was in the export string it kept throwing 403 error. “Select” was ok but "Select x where x=any character after, it was forbidden. EncodeURI or EncodeURIComponent(Export string…didn’t fix it.
In short my questions are…
Is this expected?
Is there any other traps I should know?
Is it server dependant?