BUGFIX: Properly encode error message in internal request header #2756
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According to the HTTP spec, characters like line breaks and some other are not allowed within a request header. Exception messages typically include those. Since guzzlehttp/psr7 1.8.4 it validates headers to this spec and makes our builds fail. This fixes that by base64 encoding the exception message we transfer via the
X-Flow-ExceptionMessage
header. Currently there is no code in the core that uses this header, but if you read this header at some obscure place, you need tobase64_decode()
the value first.See https://github.com/guzzle/psr7/pull/486/files#diff-fb174524a7bba27ce140bc6ccd1c30811a6abeed9328e783b326189551ba7ed4R253