httputil: Fix quadratic behavior in _parseparam #3554
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Prior to this change, _parseparam had O(n^2) behavior when parsing certain inputs, which could be a DoS vector. This change adapts logic from the equivalent function in the python standard library in https://github.com/python/cpython/pull/136072/files
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Prior to this change, _parseparam had O(n^2) behavior when parsing certain inputs, which could be a DoS vector. This change adapts logic from the equivalent function in the python standard library in https://github.com/python/cpython/pull/136072/files