When searching very large forums then changing pages of your results (pagination), you can get get the error (Request URL Too Long). This is due to SMF attempting to send a URL greater than 43000 bytes which is more than the server can handle (or should handle). There is absolutely no reason to attempt to pass this amount of data in a URL, there are other more efficient ways (We have use one of them).
[Chg:] Version 1.12 - 03/08/2017 - Removed error conditions from the error log. Operations did not change.