org.apache.juneau.http.Host Maven / Gradle / Ivy
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package org.apache.juneau.http;
/**
* Represents a parsed Host HTTP request header.
*
*
* 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.
* Mandatory since HTTP/1.1.
*
*
Example
*
* Host: en.wikipedia.org:8080
* Host: en.wikipedia.org
*
*
* RFC2616 Specification
*
* The Host request-header field specifies the Internet host and port number of the resource being requested, as
* obtained from the original URI given by the user or referring resource (generally an HTTP URL, as described in
* section 3.2.2).
* The Host field value MUST represent the naming authority of the origin server or gateway given by the original URL.
* This allows the origin server or gateway to differentiate between internally-ambiguous URLs, such as the root "/" URL
* of a server for multiple host names on a single IP address.
*
*
* Host = "Host" ":" host [ ":" port ] ; Section 3.2.2
*
*
*
* A "host" without any trailing port information implies the default port for the service requested (e.g., "80" for an
* HTTP URL).
* For example, a request on the origin server for <http://www.w3.org/pub/WWW/> would properly include:
*
* GET /pub/WWW/ HTTP/1.1
* Host: www.w3.org
*
*
*
* A client MUST include a Host header field in all HTTP/1.1 request messages.
* If the requested URI does not include an Internet host name for the service being requested, then the Host header
* field MUST be given with an empty value.
* An HTTP/1.1 proxy MUST ensure that any request message it forwards does contain an appropriate Host header field that
* identifies the service being requested by the proxy.
* All Internet-based HTTP/1.1 servers MUST respond with a 400 (Bad Request) status code to any HTTP/1.1 request
* message which lacks a Host header field.
*
*
* See sections 5.2 and 19.6.1.1 for other requirements relating to Host.
*
*
Additional Information
*
*/
public final class Host extends HeaderString {
/**
* Returns a parsed Host header.
*
* @param value The Host header string.
* @return The parsed Host header, or null if the string was null.
*/
public static Host forString(String value) {
if (value == null)
return null;
return new Host(value);
}
private Host(String value) {
super(value);
}
}