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Content-length and chunk size parsing now strictly matches the RFCs. We previously used the python int() function which accepted leading plus signs and internal underscores, which are not allowed by the HTTP RFCs (it also accepts minus signs, but these are less problematic in this context since they'd result in errors elsewhere) It is important to fix this because when combined with certain proxies, the lax parsing could result in a request smuggling vulnerability (if both Tornado and the proxy accepted an invalid content-length but interpreted it differently). This is known to occur with old versions of haproxy, although the current version of haproxy is unaffected.
The github security advisory feature lets you make private PRs but it apparently doesn't support CI so this log failure wasn't caught until after the PR was merged.
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