Backport of Add known issue about OCSP GET redirection responses into release/1.13.x #19613
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Backport
This PR is auto-generated from #19523 to be assessed for backporting due to the inclusion of the label backport/1.13.x.
The below text is copied from the body of the original PR.
Write up the discovered issue of OCSP GET requests that contain multiple '/' characters within the encoded request, being responded with a 301 HTTP Permanent redirect status code instead of a valid OCSP response.
The workaround for now is to submit the OCSP request using HTTP POST instead of GET which does not suffer from Go's HTTP mux getting in the way and returning the redirection response to the end-user.
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