Don't allow CRLF in headers #2258
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Description
Fixes potential exposure of applications that use RestSharp and allow users to provide header values to execute a request with CRLF in the header value possibly causing SSRF.
Purpose
This pull request is a:
It's breaking change since some users might be required to send invalid header values. Also, the new version is not binary-compatible with the previous version, so the fix will be released as a major version.