Hardening/1751 syntax for uri param q and exists #1756
Merged
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Changed +attr/-attr for attr/!attr in q-string
Added lots of sanity checks for q and q-parts.
Fixes issues #1751 and #1754
Apart from these two issues, q is inspected not to:
These two last checks had to be made before the strtok-loop as strtok doesn't return empty tokens, it just eats them ...