Module io.helidon.common.http
Package io.helidon.common.http

Class Http.Header

java.lang.Object
io.helidon.common.http.Http.Header
Enclosing class:
Http
public static final class Http.Header extends Object
Utility class with a list of names of standard HTTP headers and related tooling methods.

  • Field Details

    • ACCEPT

      public static final String ACCEPT
      The "Accept" header name. Content-Types that are acceptedTypes for the response.
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    • ACCEPT_CHARSET

      public static final String ACCEPT_CHARSET
      The "Accept-Charset" header name. Character sets that are acceptedTypes.
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    • ACCEPT_ENCODING

      public static final String ACCEPT_ENCODING
      The "Accept-Encoding" header name. List of acceptedTypes encodings.
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    • ACCEPT_LANGUAGE

      public static final String ACCEPT_LANGUAGE
      The "Accept-Language" header name. List of acceptedTypes human languages for response.
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    • ACCEPT_DATETIME

      public static final String ACCEPT_DATETIME
      The "Accept-Datetime" header name. Acceptable version in time.
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    • AUTHORIZATION

      public static final String AUTHORIZATION
      The "Authorization" header name. Authentication credentials for HTTP authentication.
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    • EXPECT

      public static final String EXPECT
      The "Expect" header name. Indicates that particular server behaviors are required by the client.
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    • FORWARDED

      public static final String FORWARDED
      The "Forwarded" header name. Disclose original information of a client connecting to a web server through an HTTP proxy.
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    • X_FORWARDED_FOR

      public static final String X_FORWARDED_FOR
      The X-Forwarded-For header name. Used to represent the original host requested by a client, when request passed through a proxy server.
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    • X_FORWARDED_HOST

      public static final String X_FORWARDED_HOST
      The X-Forwarded-Host header name. Used to represent the original host requested by a client, when request passed through a proxy server.
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    • X_FORWARDED_PORT

      public static final String X_FORWARDED_PORT
      The X-Forwarded-Port header name. Used to represent the original port requested by a client, when request passed through a proxy server.
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    • X_FORWARDED_PREFIX

      public static final String X_FORWARDED_PREFIX
      The X-Forwarded-Prefix header name. Used to represent the original path prefix requested by a client, when request passed through a proxy server.
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    • X_FORWARDED_PROTO

      public static final String X_FORWARDED_PROTO
      The X-Forwarded-Proto header name. Used to represent the original protocol used by a client, when request passed through a proxy server.
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    • FROM

      public static final String FROM
      The "From" header name. The email address of the user making the request.
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    • HOST

      public static final String HOST
      The "Host" header name. The domain name of the server (for virtual hosting), and the TCP port number on which the server is listening. The port number may be omitted if the port is the standard port for the service requested.
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    • IF_MATCH

      public static final String IF_MATCH
      The "If-Match" header name. Only perform the action if the client supplied entity matches the same entity on the server. This is mainly for methods like PUT to only update a resource if it has not been modified since the user last updated it.
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    • IF_MODIFIED_SINCE

      public static final String IF_MODIFIED_SINCE
      The "If-Modified-Since" header name. Allows a 304 Not Modified to be returned if content is unchanged.
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    • IF_NONE_MATCH

      public static final String IF_NONE_MATCH
      The "If-None-Match" header name. Allows a 304 Not Modified to be returned if content is unchanged, based on ETAG.
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    • IF_RANGE

      public static final String IF_RANGE
      The "If-Range" header name. If the entity is unchanged, send me the part(s) that I am missing; otherwise, send me the entire new entity.
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    • IF_UNMODIFIED_SINCE

      public static final String IF_UNMODIFIED_SINCE
      The "If-Unmodified-Since" header name. Only send the response if the entity has not been modified since a specific time.
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    • MAX_FORWARDS

      public static final String MAX_FORWARDS
      The "Max-Forwards" header name. Limit the number of times the message can be forwarded through proxies or gateways.
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    • ORIGIN

      public static final String ORIGIN
      The "Origin" header name. Initiates a request for cross-origin resource sharing (asks server for an 'Access-Control-Allow-Origin' response field).
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    • RANGE

      public static final String RANGE
      The "Range" header name. Request only part of an entity. Bytes are numbered from 0.
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    • REFERER

      public static final String REFERER
      The "Referer" header name. This is the address of the previous web page from which a link to the currently requested page was followed. (The word referrer has been misspelled in the RFC as well as in most implementations to the point that it has become standard usage and is considered correct terminology.)
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    • TE

      public static final String TE
      The "TE" header name. The transfer encodings the user agent is willing to acceptedTypes: the same values as for the response header field Transfer-Encoding can be used, plus the trailers value (related to the chunked transfer method) to notify the server it expects to receive additional fields in the trailer after the last, zero-sized, chunk.
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    • USER_AGENT

      public static final String USER_AGENT
      The "User-Agent" header name. The user agent string of the user agent.
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    • VIA

      public static final String VIA
      The "Via" header name. Informs the server of proxies through which the request was sent.
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    • ACCEPT_PATCH

      public static final String ACCEPT_PATCH
      The "Accept-Patch" header name. Specifies which patch document formats this server supports.
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    • ACCEPT_RANGES

      public static final String ACCEPT_RANGES
      The "Accept-Ranges" header name. What partial content range types this server supports via byte serving.
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    • AGE

      public static final String AGE
      The "Age" header name. The age the object has been in a proxy cache in seconds.
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    • ALLOW

      public static final String ALLOW
      The "Allow" header name. Valid actions for a specified resource. To be used for a 405 Method not allowed.
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    • ALT_SVC

      public static final String ALT_SVC
      The "Alt-Svc" header name. A server uses Alt-Svc header (meaning Alternative Services) to indicate that its resources can also be accessed at a different network location (host or port) or using a different protocol.
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    • CACHE_CONTROL

      public static final String CACHE_CONTROL
      The "Cache-Control" header name. Tells all caching mechanisms from server to client whether they may cache this object. It is measured in seconds.
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    • CONNECTION

      public static final String CONNECTION
      The "Connection" header name. Control options for the current connection and list of hop-by-hop response fields.
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    • CONTENT_DISPOSITION

      public static final String CONTENT_DISPOSITION
      The "Content-Disposition" header name. An opportunity to raise a File Download dialogue box for a known MIME type with binary format or suggest a filename for dynamic content. Quotes are necessary with special characters.
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    • CONTENT_ENCODING

      public static final String CONTENT_ENCODING
      The "Content-Encoding" header name. The type of encoding used on the data.
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    • CONTENT_LANGUAGE

      public static final String CONTENT_LANGUAGE
      The "Content-Language" header name. The natural language or languages of the intended audience for the enclosed content.
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    • CONTENT_LENGTH

      public static final String CONTENT_LENGTH
      The "Content-Length" header name. The length of the response body in octets.
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    • CONTENT_LOCATION

      public static final String CONTENT_LOCATION
      The "aa" header name. An alternate location for the returned data.
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    • CONTENT_RANGE

      public static final String CONTENT_RANGE
      The "Content-Range" header name. Where in a full body message this partial message belongs.
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    • CONTENT_TYPE

      public static final String CONTENT_TYPE
      The "Content-Type" header name. The MIME type of this content.
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    • DATE

      public static final String DATE
      The "Date" header name. The date and time that the message was sent (in HTTP-date format as defined by RFC 7231).
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    • ETAG

      public static final String ETAG
      The "ETag" header name. An identifier for a specific version of a resource, often a message digest.
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    • EXPIRES

      public static final String EXPIRES
      The "Expires" header name. Gives the date/time after which the response is considered stale (in HTTP-date format as defined by RFC 7231)
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    • LAST_MODIFIED

      public static final String LAST_MODIFIED
      The "Last-Modified" header name. The last modified date for the requested object (in HTTP-date format as defined by RFC 7231)
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    • LOCATION

      public static final String LOCATION
      The "Location" header name. Used in redirection, or whenRequest a new resource has been created.
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    • PRAGMA

      public static final String PRAGMA
      The "Pragma" header name. Implementation-specific fields that may have various effects anywhere along the request-response chain.
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    • PUBLIC_KEY_PINS

      public static final String PUBLIC_KEY_PINS
      The "Public-Key-Pins" header name. HTTP Public Key Pinning, announces hash of website's authentic TLS certificate.
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    • RETRY_AFTER

      public static final String RETRY_AFTER
      The "Retry-After" header name. If an entity is temporarily unavailable, this instructs the client to try again later. Value could be a specified period of time (in seconds) or an HTTP-date.
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    • SERVER

      public static final String SERVER
      The "Server" header name. A name for the server.
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    • STRICT_TRANSPORT_SECURITY

      public static final String STRICT_TRANSPORT_SECURITY
      The "Strict-Transport-Security" header name. A HSTS Policy informing the HTTP client how long to cache the HTTPS only policy and whether this applies to subdomains.
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    • TRAILER

      public static final String TRAILER
      The "Trailer" header name. The Trailer general field value indicates that the given set of header fields is present in the trailer of a message encoded with chunked transfer coding.
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    • TRANSFER_ENCODING

      public static final String TRANSFER_ENCODING
      The "Transfer-Encoding" header name. The form of encoding used to safely transfer the entity to the user. Currently defined methods are: chunked, compress, deflate, gzip, identity.
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    • TSV

      public static final String TSV
      The "TSV" header name. Tracking Status Value, value suggested to be sent in response to a DNT(do-not-track).
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    • UPGRADE

      public static final String UPGRADE
      The "Upgrade" header name. Ask to upgrade to another protocol.
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    • VARY

      public static final String VARY
      The "Vary" header name. Tells downstream proxies how to match future request headers to decide whether the cached response can be used rather than requesting a fresh one from the origin server.
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    • WARNING

      public static final String WARNING
      The "Warning" header name. A general warning about possible problems with the entity body.
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    • WWW_AUTHENTICATE

      public static final String WWW_AUTHENTICATE
      The "WWW-Authenticate" header name. Indicates the authentication scheme that should be used to access the requested entity.
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    • X_HELIDON_CN

      public static final String X_HELIDON_CN
      The "X-HELIDON-CN" header name. Corresponds to the certificate CN subject value when client authentication enabled. This header will be removed if it is part of the request.
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