is_none()unsafe precondition(s) violated: NonNull::new_unchecked requires that the pointer is non-null

This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.acceptaccept-charsetaccept-encodingaccept-languageaccept-rangesaccess-control-allow-headersaccess-control-allow-methodsaccess-control-allow-originaccess-control-expose-headersaccess-control-max-ageaccess-control-request-headersaccess-control-request-methodageallowalt-svcauthorizationcache-controlcache-statuscdn-cache-controlconnectioncontent-dispositioncontent-lengthcontent-rangecontent-security-policycontent-security-policy-report-onlycontent-typecookiedntexpectexpiresforwardedif-modified-sinceif-none-matchif-unmodified-sincelast-modifiedmax-forwardsoriginpragmaproxy-authenticateproxy-authorizationpublic-key-pinspublic-key-pins-report-onlyrangerefererreferrer-policyrefreshretry-aftersec-websocket-acceptsec-websocket-extensionssec-websocket-keysec-websocket-protocolsec-websocket-versionserverset-cookiestrict-transport-securitytetrailertransfer-encodinguser-agentupgradeupgrade-insecure-requestsviawarningx-content-type-optionsx-dns-prefetch-controlx-frame-options