# HttpKnownHeaderNames

Kind: Class  
Namespace: `Sisk.Core.Http`  
Assembly: `Sisk.Core.dll`  
Source: https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.html

Provides most of the most commonly known HTTP headers for constants.

```csharp
public static class HttpKnownHeaderNames
```

#### Inheritance

[object](https://learn.microsoft.com/dotnet/api/system.object) ← 
[HttpKnownHeaderNames](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.md)

#### Inherited Members

[object.GetType\(\)](https://learn.microsoft.com/dotnet/api/system.object.gettype), 
[object.MemberwiseClone\(\)](https://learn.microsoft.com/dotnet/api/system.object.memberwiseclone), 
[object.ToString\(\)](https://learn.microsoft.com/dotnet/api/system.object.tostring), 
[object.Equals\(object?\)](https://learn.microsoft.com/dotnet/api/system.object.equals\#system\-object\-equals\(system\-object\)), 
[object.Equals\(object?, object?\)](https://learn.microsoft.com/dotnet/api/system.object.equals\#system\-object\-equals\(system\-object\-system\-object\)), 
[object.ReferenceEquals\(object?, object?\)](https://learn.microsoft.com/dotnet/api/system.object.referenceequals), 
[object.GetHashCode\(\)](https://learn.microsoft.com/dotnet/api/system.object.gethashcode)

## Fields

| Name | Description |
| --- | --- |
| [Accept](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Accept.md#Sisk_Core_Http_HttpKnownHeaderNames_Accept) | The HTTP Accept header. Specifies the media types that are acceptable for the response, allowing the client to indicate its preferences. |
| [AcceptCH](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AcceptCH.md#Sisk_Core_Http_HttpKnownHeaderNames_AcceptCH) | The HTTP Accept-CH header. Specifies the client hints that the server supports, allowing clients to provide additional information about their capabilities. |
| [AcceptCharset](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AcceptCharset.md#Sisk_Core_Http_HttpKnownHeaderNames_AcceptCharset) | The HTTP Accept-Charset header. Indicates the character sets that are acceptable for the response, allowing the client to specify its preferred encoding. |
| [AcceptEncoding](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AcceptEncoding.md#Sisk_Core_Http_HttpKnownHeaderNames_AcceptEncoding) | The HTTP Accept-Encoding header. Specifies the content encodings that are acceptable for the response, allowing the client to indicate its preferences for compression. |
| [AcceptLanguage](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AcceptLanguage.md#Sisk_Core_Http_HttpKnownHeaderNames_AcceptLanguage) | The HTTP Accept-Language header. Indicates the natural languages that are preferred for the response, allowing the client to specify its language preferences. |
| [AcceptPatch](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AcceptPatch.md#Sisk_Core_Http_HttpKnownHeaderNames_AcceptPatch) | The HTTP Accept-Patch header. Indicates the patch document formats that are acceptable for the response, allowing the client to specify its preferences for patching resources. |
| [AcceptPost](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AcceptPost.md#Sisk_Core_Http_HttpKnownHeaderNames_AcceptPost) | The HTTP Accept-Post header. Specifies which media types are accepted by the server in a POST request. |
| [AcceptQuery](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AcceptQuery.md#Sisk_Core_Http_HttpKnownHeaderNames_AcceptQuery) | The HTTP Accept-Query header. Specifies which media types are accepted by the server in a QUERY request. |
| [AcceptRanges](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AcceptRanges.md#Sisk_Core_Http_HttpKnownHeaderNames_AcceptRanges) | The HTTP Accept-Ranges header. Indicates that the server supports range requests for the resource, allowing clients to request specific byte ranges. |
| [AccessControlAllowCredentials](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AccessControlAllowCredentials.md#Sisk_Core_Http_HttpKnownHeaderNames_AccessControlAllowCredentials) | The HTTP Access-Control-Allow-Credentials header. Indicates whether the response to the request can expose credentials, allowing cross-origin requests to include credentials. |
| [AccessControlAllowHeaders](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AccessControlAllowHeaders.md#Sisk_Core_Http_HttpKnownHeaderNames_AccessControlAllowHeaders) | The HTTP Access-Control-Allow-Headers header. Specifies which headers can be used when making the actual request in a cross-origin resource sharing (CORS) context. |
| [AccessControlAllowMethods](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AccessControlAllowMethods.md#Sisk_Core_Http_HttpKnownHeaderNames_AccessControlAllowMethods) | The HTTP Access-Control-Allow-Methods header. Specifies the methods that are allowed when accessing the resource in a CORS context. |
| [AccessControlAllowOrigin](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AccessControlAllowOrigin.md#Sisk_Core_Http_HttpKnownHeaderNames_AccessControlAllowOrigin) | The HTTP Access-Control-Allow-Origin header. Specifies which origins are allowed to access the resource in a CORS context, helping to control cross-origin requests. |
| [AccessControlExposeHeaders](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AccessControlExposeHeaders.md#Sisk_Core_Http_HttpKnownHeaderNames_AccessControlExposeHeaders) | The HTTP Access-Control-Expose-Headers header. Indicates which headers can be exposed as part of the response to a cross-origin request. |
| [AccessControlMaxAge](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AccessControlMaxAge.md#Sisk_Core_Http_HttpKnownHeaderNames_AccessControlMaxAge) | The HTTP Access-Control-Max-Age header. Specifies how long the results of a preflight request can be cached, reducing the number of preflight requests made. |
| [AccessControlRequestHeaders](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AccessControlRequestHeaders.md#Sisk_Core_Http_HttpKnownHeaderNames_AccessControlRequestHeaders) | The HTTP Access-Control-Request-Headers header. |
| [AccessControlRequestMethod](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AccessControlRequestMethod.md#Sisk_Core_Http_HttpKnownHeaderNames_AccessControlRequestMethod) | The HTTP Access-Control-Request-Method header. |
| [Age](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Age.md#Sisk_Core_Http_HttpKnownHeaderNames_Age) | The HTTP Age header. Indicates the age of the object in a cache, helping clients understand how fresh the cached response is. |
| [Allow](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Allow.md#Sisk_Core_Http_HttpKnownHeaderNames_Allow) | The HTTP Allow header. Lists the HTTP methods that are supported by the resource, informing clients about the available actions. |
| [AltSvc](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.AltSvc.md#Sisk_Core_Http_HttpKnownHeaderNames_AltSvc) | The HTTP Alt-Svc header. Indicates that an alternative service is available for the resource, allowing clients to connect to a different server or protocol. |
| [Authorization](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Authorization.md#Sisk_Core_Http_HttpKnownHeaderNames_Authorization) | The HTTP Authorization header. Contains credentials for authenticating the client with the server, often used for basic or bearer token authentication. |
| [CacheControl](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.CacheControl.md#Sisk_Core_Http_HttpKnownHeaderNames_CacheControl) | The HTTP Cache-Control header. Directs caching mechanisms on how to cache the response, including directives for expiration and revalidation. |
| [Connection](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Connection.md#Sisk_Core_Http_HttpKnownHeaderNames_Connection) | The HTTP Connection header. Controls whether the network connection stays open after the current transaction finishes, allowing for persistent connections. |
| [ContentDisposition](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ContentDisposition.md#Sisk_Core_Http_HttpKnownHeaderNames_ContentDisposition) | The HTTP Content-Disposition header. Indicates if the content should be displayed inline in the browser or treated as an attachment to be downloaded. |
| [ContentEncoding](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ContentEncoding.md#Sisk_Core_Http_HttpKnownHeaderNames_ContentEncoding) | The HTTP Content-Encoding header. Specifies the encoding transformations that have been applied to the response body, such as gzip or deflate. |
| [ContentLanguage](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ContentLanguage.md#Sisk_Core_Http_HttpKnownHeaderNames_ContentLanguage) | The HTTP Content-Language header. Indicates the natural language(s) of the intended audience for the response, helping clients understand the content's language. |
| [ContentLength](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ContentLength.md#Sisk_Core_Http_HttpKnownHeaderNames_ContentLength) | The HTTP Content-Length header. Indicates the size of the response body in bytes, allowing the client to know how much data to expect. |
| [ContentLocation](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ContentLocation.md#Sisk_Core_Http_HttpKnownHeaderNames_ContentLocation) | The HTTP Content-Location header. Indicates an alternate location for the returned data, often used for redirecting clients to a different resource. |
| [ContentMD5](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ContentMD5.md#Sisk_Core_Http_HttpKnownHeaderNames_ContentMD5) | The HTTP Content-MD5 header. Contains the MD5 hash of the response body, allowing clients to verify the integrity of the received data. |
| [ContentRange](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ContentRange.md#Sisk_Core_Http_HttpKnownHeaderNames_ContentRange) | The HTTP Content-Range header. Indicates the part of a document that the server is returning, used in range requests to specify byte ranges. |
| [ContentSecurityPolicy](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ContentSecurityPolicy.md#Sisk_Core_Http_HttpKnownHeaderNames_ContentSecurityPolicy) | The HTTP Content-Security-Policy header. Defines security policies for the content, helping to prevent cross-site scripting (XSS) and other code injection attacks. |
| [ContentType](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ContentType.md#Sisk_Core_Http_HttpKnownHeaderNames_ContentType) | The HTTP Content-Type header. Indicates the media type of the resource, allowing the client to understand how to process the response body. |
| [Cookie](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Cookie.md#Sisk_Core_Http_HttpKnownHeaderNames_Cookie) | The HTTP Cookie header. Contains stored HTTP cookies previously sent by the server, allowing the server to identify the client on subsequent requests. |
| [Cookie2](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Cookie2.md#Sisk_Core_Http_HttpKnownHeaderNames_Cookie2) | The HTTP Cookie2 header. Used to send cookies in a more advanced format, primarily for compatibility with older versions of HTTP. |
| [Date](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Date.md#Sisk_Core_Http_HttpKnownHeaderNames_Date) | The HTTP Date header. Indicates the date and time at which the message was sent, helping clients understand the freshness of the response. |
| [Dnt](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Dnt.md#Sisk_Core_Http_HttpKnownHeaderNames_Dnt) | The HTTP DNT header. The HTTP DNT (Do Not Track) request header indicates the user's tracking preference. |
| [ETag](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ETag.md#Sisk_Core_Http_HttpKnownHeaderNames_ETag) | The HTTP ETag header. Provides a unique identifier for a specific version of a resource, allowing clients to cache and validate resources efficiently. |
| [Expect](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Expect.md#Sisk_Core_Http_HttpKnownHeaderNames_Expect) | The HTTP Expect header. Indicates that the client expects certain behaviors from the server, such as support for specific features or conditions. |
| [Expires](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Expires.md#Sisk_Core_Http_HttpKnownHeaderNames_Expires) | The HTTP Expires header. Indicates the date and time after which the response is considered stale, helping clients manage caching. |
| [Host](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Host.md#Sisk_Core_Http_HttpKnownHeaderNames_Host) | The HTTP Host header. Specifies the domain name of the server and the TCP port number on which the server is listening, allowing for virtual hosting. |
| [IfMatch](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.IfMatch.md#Sisk_Core_Http_HttpKnownHeaderNames_IfMatch) | The HTTP If-Match header. Used to make a conditional request, allowing the client to specify that the request should only be processed if the resource matches the given ETag. |
| [IfModifiedSince](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.IfModifiedSince.md#Sisk_Core_Http_HttpKnownHeaderNames_IfModifiedSince) | The HTTP If-Modified-Since header. Used to make a conditional request, allowing the client to specify that the resource should only be returned if it has been modified since the given date. |
| [IfNoneMatch](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.IfNoneMatch.md#Sisk_Core_Http_HttpKnownHeaderNames_IfNoneMatch) | The HTTP If-None-Match header. Used to make a conditional request, allowing the client to specify that the resource should only be returned if it does not match the given ETag. |
| [IfRange](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.IfRange.md#Sisk_Core_Http_HttpKnownHeaderNames_IfRange) | The HTTP If-Range header. Used to make a conditional range request, allowing the client to specify that the range should only be returned if the resource has not changed. |
| [IfUnmodifiedSince](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.IfUnmodifiedSince.md#Sisk_Core_Http_HttpKnownHeaderNames_IfUnmodifiedSince) | The HTTP If-Unmodified-Since header. Used to make a conditional request, allowing the client to specify that the resource should only be returned if it has not been modified since the given date. |
| [KeepAlive](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.KeepAlive.md#Sisk_Core_Http_HttpKnownHeaderNames_KeepAlive) | The HTTP Keep-Alive header. Used to specify parameters for persistent connections, allowing the client and server to maintain an open connection for multiple requests. |
| [LastModified](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.LastModified.md#Sisk_Core_Http_HttpKnownHeaderNames_LastModified) | The HTTP Last-Modified header. Indicates the date and time at which the resource was last modified, helping clients determine if they need to refresh their cached version. |
| [Link](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Link.md#Sisk_Core_Http_HttpKnownHeaderNames_Link) | The HTTP Link header. Used to provide relationships between the current resource and other resources, often used for navigation and linking. |
| [Location](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Location.md#Sisk_Core_Http_HttpKnownHeaderNames_Location) | The HTTP Location header. Used in redirection responses to indicate the URL to which the client should redirect. |
| [MaxForwards](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.MaxForwards.md#Sisk_Core_Http_HttpKnownHeaderNames_MaxForwards) | The HTTP Max-Forwards header. Used in OPTIONS requests to limit the number of times the request can be forwarded by proxies. |
| [Origin](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Origin.md#Sisk_Core_Http_HttpKnownHeaderNames_Origin) | The HTTP Origin header. Indicates the origin of the request, helping servers implement CORS and manage cross-origin requests. |
| [P3P](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.P3P.md#Sisk_Core_Http_HttpKnownHeaderNames_P3P) | The HTTP P3P header. Used to indicate the privacy policy of the server, allowing clients to understand how their data will be handled. |
| [Pragma](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Pragma.md#Sisk_Core_Http_HttpKnownHeaderNames_Pragma) | The HTTP Pragma header. Used to include implementation-specific directives that might apply to any recipient along the request/response chain. |
| [ProxyAuthenticate](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ProxyAuthenticate.md#Sisk_Core_Http_HttpKnownHeaderNames_ProxyAuthenticate) | The HTTP Proxy-Authenticate header. Used by a proxy server to request authentication from the client, indicating the authentication method required. |
| [ProxyAuthorization](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ProxyAuthorization.md#Sisk_Core_Http_HttpKnownHeaderNames_ProxyAuthorization) | The HTTP Proxy-Authorization header. Contains credentials for authenticating the client with a proxy server, allowing access to the requested resource. |
| [ProxyConnection](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.ProxyConnection.md#Sisk_Core_Http_HttpKnownHeaderNames_ProxyConnection) | The HTTP Proxy-Connection header. Used to control whether the network connection to the proxy server should be kept open after the current transaction. |
| [PublicKeyPins](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.PublicKeyPins.md#Sisk_Core_Http_HttpKnownHeaderNames_PublicKeyPins) | The HTTP Public-Key-Pins header. Used to prevent man-in-the-middle attacks by specifying which public keys are valid for the server's certificate. |
| [Range](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Range.md#Sisk_Core_Http_HttpKnownHeaderNames_Range) | The HTTP Range header. Used to request a specific range of bytes from a resource, allowing clients to download large files in parts. |
| [Referer](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Referer.md#Sisk_Core_Http_HttpKnownHeaderNames_Referer) | The HTTP Referer header. Indicates the URL of the resource from which the request originated, helping servers understand the source of traffic. |
| [RetryAfter](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.RetryAfter.md#Sisk_Core_Http_HttpKnownHeaderNames_RetryAfter) | The HTTP Retry-After header. Indicates how long the client should wait before making a follow-up request, often used in rate limiting scenarios. |
| [SecGPC](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.SecGPC.md#Sisk_Core_Http_HttpKnownHeaderNames_SecGPC) | The HTTP Sec-GPC header. The HTTP Sec-GPC request header is part of the Global Privacy Control (GPC) mechanism to indicate whether the user consents to a website or service selling or sharing their personal information with third parties. |
| [SecWebSocketAccept](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.SecWebSocketAccept.md#Sisk_Core_Http_HttpKnownHeaderNames_SecWebSocketAccept) | The HTTP Sec-WebSocket-Accept header. Used in the WebSocket handshake to confirm the server's acceptance of the connection request. |
| [SecWebSocketExtensions](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.SecWebSocketExtensions.md#Sisk_Core_Http_HttpKnownHeaderNames_SecWebSocketExtensions) | The HTTP Sec-WebSocket-Extensions header. Used to negotiate WebSocket extensions during the handshake, allowing for additional features and capabilities. |
| [SecWebSocketKey](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.SecWebSocketKey.md#Sisk_Core_Http_HttpKnownHeaderNames_SecWebSocketKey) | The HTTP Sec-WebSocket-Key header. Contains a base64-encoded value used to establish a WebSocket connection, ensuring the request is valid. |
| [SecWebSocketProtocol](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.SecWebSocketProtocol.md#Sisk_Core_Http_HttpKnownHeaderNames_SecWebSocketProtocol) | The HTTP Sec-WebSocket-Protocol header. Used to specify subprotocols that the client wishes to use during the WebSocket connection. |
| [SecWebSocketVersion](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.SecWebSocketVersion.md#Sisk_Core_Http_HttpKnownHeaderNames_SecWebSocketVersion) | The HTTP Sec-WebSocket-Version header. Indicates the version of the WebSocket protocol that the client wishes to use. |
| [Server](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Server.md#Sisk_Core_Http_HttpKnownHeaderNames_Server) | The HTTP Server header. Contains information about the server software handling the request, often used for informational purposes. |
| [SetCookie](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.SetCookie.md#Sisk_Core_Http_HttpKnownHeaderNames_SetCookie) | The HTTP Set-Cookie header. Used to send cookies from the server to the client, allowing the server to store state information on the client. |
| [SetCookie2](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.SetCookie2.md#Sisk_Core_Http_HttpKnownHeaderNames_SetCookie2) | The HTTP Set-Cookie2 header. Used to send cookies in a more advanced format, primarily for compatibility with older versions of HTTP. |
| [StrictTransportSecurity](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.StrictTransportSecurity.md#Sisk_Core_Http_HttpKnownHeaderNames_StrictTransportSecurity) | The HTTP Strict-Transport-Security header. Enforces secure (HTTPS) connections to the server, helping to prevent man-in-the-middle attacks. |
| [TE](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.TE.md#Sisk_Core_Http_HttpKnownHeaderNames_TE) | The HTTP TE header. Indicates the transfer encodings that are acceptable for the response, allowing for content negotiation. |
| [TSV](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.TSV.md#Sisk_Core_Http_HttpKnownHeaderNames_TSV) | The HTTP TSV header. Used to indicate the type of data being sent in a transaction, often used in specific applications or protocols. |
| [Trailer](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Trailer.md#Sisk_Core_Http_HttpKnownHeaderNames_Trailer) | The HTTP Trailer header. Indicates that the sender will include additional fields in the message trailer, which can be used for metadata. |
| [TransferEncoding](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.TransferEncoding.md#Sisk_Core_Http_HttpKnownHeaderNames_TransferEncoding) | The HTTP Transfer-Encoding header. Specifies the form of encoding used to safely transfer the payload body to the user. |
| [Upgrade](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Upgrade.md#Sisk_Core_Http_HttpKnownHeaderNames_Upgrade) | The HTTP Upgrade header. Indicates that the client prefers to upgrade to a different protocol, such as switching from HTTP/1.1 to HTTP/2. |
| [UpgradeInsecureRequests](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.UpgradeInsecureRequests.md#Sisk_Core_Http_HttpKnownHeaderNames_UpgradeInsecureRequests) | The HTTP Upgrade-Insecure-Requests header. Indicates that the client prefers to receive an upgraded version of the resource over HTTPS instead of HTTP. |
| [UserAgent](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.UserAgent.md#Sisk_Core_Http_HttpKnownHeaderNames_UserAgent) | The HTTP User-Agent header. Contains information about the user agent (browser or application) making the request, including its version and platform. |
| [Vary](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Vary.md#Sisk_Core_Http_HttpKnownHeaderNames_Vary) | The HTTP Vary header. Indicates that the response varies based on the value of the specified request headers, allowing for content negotiation. |
| [Via](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Via.md#Sisk_Core_Http_HttpKnownHeaderNames_Via) | The HTTP Via header. Used to track message forwards and proxies, indicating the intermediate protocols and recipients involved in the request/response chain. |
| [WWWAuthenticate](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.WWWAuthenticate.md#Sisk_Core_Http_HttpKnownHeaderNames_WWWAuthenticate) | The HTTP WWW-Authenticate header. Used in response to a request for authentication, indicating the authentication method that should be used to access the resource. |
| [Warning](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Warning.md#Sisk_Core_Http_HttpKnownHeaderNames_Warning) | The HTTP Warning header. Provides additional information about the status or transformation of a message, often used for caching and validation. |
| [XContentDuration](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.XContentDuration.md#Sisk_Core_Http_HttpKnownHeaderNames_XContentDuration) | The HTTP X-Content-Duration header. Specifies the duration of the content in seconds, often used for media files. |
| [XContentTypeOptions](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.XContentTypeOptions.md#Sisk_Core_Http_HttpKnownHeaderNames_XContentTypeOptions) | The HTTP X-Content-Type-Options header. Used to prevent MIME type sniffing, ensuring that the browser respects the declared content type. |
| [XForwardedFor](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.XForwardedFor.md#Sisk_Core_Http_HttpKnownHeaderNames_XForwardedFor) | The HTTP X-Forwarded-For header. Used to identify the originating IP address of a client connecting to a web server through an HTTP proxy or load balancer. |
| [XForwardedHost](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.XForwardedHost.md#Sisk_Core_Http_HttpKnownHeaderNames_XForwardedHost) | The HTTP X-Forwarded-Host header. Used to identify the original host requested by the client in the Host HTTP request header, often used in proxy setups. |
| [XFrameOptions](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.XFrameOptions.md#Sisk_Core_Http_HttpKnownHeaderNames_XFrameOptions) | The HTTP X-Frame-Options header. Used to control whether a browser should be allowed to render a page in a iframe, frame, embed or object tag, helping to prevent clickjacking attacks. |
| [XPoweredBy](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.XPoweredBy.md#Sisk_Core_Http_HttpKnownHeaderNames_XPoweredBy) | The HTTP X-Powered-By header. Indicates the technology or framework that powers the web application, often used for informational purposes. |
| [XRequestID](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.XRequestID.md#Sisk_Core_Http_HttpKnownHeaderNames_XRequestID) | The HTTP X-Request-ID header. Used to uniquely identify a request for tracking and debugging purposes, often generated by the client or server. |
| [XUACompatible](https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.XUACompatible.md#Sisk_Core_Http_HttpKnownHeaderNames_XUACompatible) | The HTTP X-UA-Compatible header. Used to specify the document mode that Internet Explorer should use to render the page, helping to ensure compatibility with older versions. |