feat: (doc) add Header Constants

docs/doc.md

@@ -34,6 +34,7 @@
   - [Bind HTML checkboxes](#bind-html-checkboxes)
   - [Multipart/Urlencoded binding](#multiparturlencoded-binding)
   - [XML, JSON, YAML, TOML and ProtoBuf rendering](#xml-json-yaml-toml-and-protobuf-rendering)
+  - [Header Constants](#header-constants)
     - [SecureJSON](#securejson)
     - [JSONP](#jsonp)
     - [AsciiJSON](#asciijson)
@@ -2431,6 +2432,141 @@ func main() {
 }
 ```
 
+### header-constants
+
+```go
+
+const (
+	HeaderAuthorization                   string = "Authorization"
+	HeaderProxyAuthenticate               string = "Proxy-Authenticate"
+	HeaderProxyAuthorization              string = "Proxy-Authorization"
+	HeaderWWWAuthenticate                 string = "WWW-Authenticate"
+	HeaderAge                             string = "Age"
+	HeaderCacheControl                    string = "Cache-Control"
+	HeaderClearSiteData                   string = "Clear-Site-Data"
+	HeaderExpires                         string = "Expires"
+	HeaderPragma                          string = "Pragma"
+	HeaderWarning                         string = "Warning"
+	HeaderAcceptCH                        string = "Accept-CH"
+	HeaderAcceptCHLifetime                string = "Accept-CH-Lifetime"
+	HeaderContentDPR                      string = "Content-DPR"
+	HeaderDPR                             string = "DPR"
+	HeaderEarlyData                       string = "Early-Data"
+	HeaderSaveData                        string = "Save-Data"
+	HeaderViewportWidth                   string = "Viewport-Width"
+	HeaderWidth                           string = "Width"
+	HeaderETag                            string = "ETag"
+	HeaderIfMatch                         string = "If-Match"
+	HeaderIfModifiedSince                 string = "If-Modified-Since"
+	HeaderIfNoneMatch                     string = "If-None-Match"
+	HeaderIfUnmodifiedSince               string = "If-Unmodified-Since"
+	HeaderLastModified                    string = "Last-Modified"
+	HeaderVary                            string = "Vary"
+	HeaderConnection                      string = "Connection"
+	HeaderKeepAlive                       string = "Keep-Alive"
+	HeaderAccept                          string = "Accept"
+	HeaderAcceptCharset                   string = "Accept-Charset"
+	HeaderAcceptEncoding                  string = "Accept-Encoding"
+	HeaderAcceptLanguage                  string = "Accept-Language"
+	HeaderCookie                          string = "Cookie"
+	HeaderExpect                          string = "Expect"
+	HeaderMaxForwards                     string = "Max-Forwards"
+	HeaderSetCookie                       string = "Set-Cookie"
+	HeaderAccessControlAllowCredentials   string = "Access-Control-Allow-Credentials"
+	HeaderAccessControlAllowHeaders       string = "Access-Control-Allow-Headers"
+	HeaderAccessControlAllowMethods       string = "Access-Control-Allow-Methods"
+	HeaderAccessControlAllowOrigin        string = "Access-Control-Allow-Origin"
+	HeaderAccessControlExposeHeaders      string = "Access-Control-Expose-Headers"
+	HeaderAccessControlMaxAge             string = "Access-Control-Max-Age"
+	HeaderAccessControlRequestHeaders     string = "Access-Control-Request-Headers"
+	HeaderAccessControlRequestMethod      string = "Access-Control-Request-Method"
+	HeaderOrigin                          string = "Origin"
+	HeaderTimingAllowOrigin               string = "Timing-Allow-Origin"
+	HeaderXPermittedCrossDomainPolicies   string = "X-Permitted-Cross-Domain-Policies"
+	HeaderDNT                             string = "DNT"
+	HeaderTk                              string = "Tk"
+	HeaderContentDisposition              string = "Content-Disposition"
+	HeaderContentEncoding                 string = "Content-Encoding"
+	HeaderContentLanguage                 string = "Content-Language"
+	HeaderContentLength                   string = "Content-Length"
+	HeaderContentLocation                 string = "Content-Location"
+	HeaderContentType                     string = "Content-Type"
+	HeaderForwarded                       string = "Forwarded"
+	HeaderVia                             string = "Via"
+	HeaderXForwardedFor                   string = "X-Forwarded-For"
+	HeaderXForwardedHost                  string = "X-Forwarded-Host"
+	HeaderXForwardedProto                 string = "X-Forwarded-Proto"
+	HeaderXForwardedProtocol              string = "X-Forwarded-Protocol"
+	HeaderXForwardedSsl                   string = "X-Forwarded-Ssl"
+	HeaderXUrlScheme                      string = "X-Url-Scheme"
+	HeaderRealIp                          string = "X-Real-IP"
+	HeaderLocation                        string = "Location"
+	HeaderFrom                            string = "From"
+	HeaderHost                            string = "Host"
+	HeaderReferer                         string = "Referer"
+	HeaderReferrerPolicy                  string = "Referrer-Policy"
+	HeaderUserAgent                       string = "User-Agent"
+	HeaderAllow                           string = "Allow"
+	HeaderServer                          string = "Server"
+	HeaderAcceptRanges                    string = "Accept-Ranges"
+	HeaderContentRange                    string = "Content-Range"
+	HeaderIfRange                         string = "If-Range"
+	HeaderRange                           string = "Range"
+	HeaderContentSecurityPolicy           string = "Content-Security-Policy"
+	HeaderContentSecurityPolicyReportOnly string = "Content-Security-Policy-Report-Only"
+	HeaderCrossOriginResourcePolicy       string = "Cross-Origin-Resource-Policy"
+	HeaderExpectCT                        string = "Expect-CT"
+	HeaderFeaturePolicy                   string = "Feature-Policy"
+	HeaderPublicKeyPins                   string = "Public-Key-Pins"
+	HeaderPublicKeyPinsReportOnly         string = "Public-Key-Pins-Report-Only"
+	HeaderStrictTransportSecurity         string = "Strict-Transport-Security"
+	HeaderUpgradeInsecureRequests         string = "Upgrade-Insecure-Requests"
+	HeaderXContentTypeOptions             string = "X-Content-Type-Options"
+	HeaderXDownloadOptions                string = "X-Download-Options"
+	HeaderXFrameOptions                   string = "X-Frame-Options"
+	HeaderXPoweredBy                      string = "X-Powered-By"
+	HeaderXXSSProtection                  string = "X-XSS-Protection"
+	HeaderLastEventID                     string = "Last-Event-ID"
+	HeaderNEL                             string = "NEL"
+	HeaderPingFrom                        string = "Ping-From"
+	HeaderPingTo                          string = "Ping-To"
+	HeaderReportTo                        string = "Report-To"
+	HeaderTE                              string = "TE"
+	HeaderTrailer                         string = "Trailer"
+	HeaderTransferEncoding                string = "Transfer-Encoding"
+	HeaderSecWebSocketAccept              string = "Sec-WebSocket-Accept"
+	HeaderSecWebSocketExtensions          string = "Sec-WebSocket-Extensions"
+	HeaderSecWebSocketKey                 string = "Sec-WebSocket-Key"
+	HeaderSecWebSocketProtocol            string = "Sec-WebSocket-Protocol"
+	HeaderSecWebSocketVersion             string = "Sec-WebSocket-Version"
+	HeaderAcceptPatch                     string = "Accept-Patch"
+	HeaderAcceptPushPolicy                string = "Accept-Push-Policy"
+	HeaderAcceptSignature                 string = "Accept-Signature"
+	HeaderAltSvc                          string = "Alt-Svc"
+	HeaderDate                            string = "Date"
+	HeaderIndex                           string = "Index"
+	HeaderLargeAllocation                 string = "Large-Allocation"
+	HeaderLink                            string = "Link"
+	HeaderPushPolicy                      string = "Push-Policy"
+	HeaderRetryAfter                      string = "Retry-After"
+	HeaderServerTiming                    string = "Server-Timing"
+	HeaderSignature                       string = "Signature"
+	HeaderSignedHeaders                   string = "Signed-Headers"
+	HeaderSourceMap                       string = "SourceMap"
+	HeaderUpgrade                         string = "Upgrade"
+	HeaderXDNSPrefetchControl             string = "X-DNS-Prefetch-Control"
+	HeaderXPingback                       string = "X-Pingback"
+	HeaderXRequestID                      string = "X-Request-ID"
+	HeaderXRequestedWith                  string = "X-Requested-With"
+	HeaderXRobotsTag                      string = "X-Robots-Tag"
+	HeaderXUACompatible                   string = "X-UA-Compatible"
+)
+
+```
+
+
+
+
 ## Don't trust all proxies
 
 Gin lets you specify which headers to hold the real client IP (if any),