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The HTTP specification does not provide a way to escape \r\n in headers, so it's the API user's responsibility to ensure the header names and values do not contain \r\n. Also header names must not contain ':'. It's an assertion, not an error, because the calling code very likely is using hard-coded values or server-provided values that do not need to be checked, and the error would be unreachable anyway. Untrusted user input must not be put directly into into HTTP headers.