jakarta.servlet.ServletConnection Maven / Gradle / Ivy
/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.servlet;
/**
* Provides information about the connection made to the Servlet container. This interface is intended primarily for
* debugging purposes and as such provides the raw information as seen by the container. Unless explicitly stated
* otherwise in the Javadoc for a method, no adjustment is made for the presence of reverse proxies or similar
* configurations.
*
* @since Servlet 6.0
*/
public interface ServletConnection {
/**
* Obtain a unique (within the lifetime of the JVM) identifier string for the network connection to the JVM that is
* being used for the {@code ServletRequest} from which this {@code ServletConnection} was obtained.
*
* There is no defined format for this string. The format is implementation dependent.
*
* @return A unique identifier for the network connection
*/
String getConnectionId();
/**
* Obtain the name of the protocol as presented to the server after the removal, if present, of any TLS or similar
* encryption. This may not be the same as the protocol seen by the application. For example, a reverse proxy may
* present AJP whereas the application will see HTTP 1.1.
*
* If the protocol has an entry in the IANA
* registry for ALPN names then the identification sequence, in string form, must be returned. Registered
* identification sequences MUST only be used for the associated protocol. Return values for other protocols are
* implementation dependent. Unknown protocols should return the string "unknown".
*
* @return The name of the protocol presented to the server after decryption of TLS, or similar encryption, if any.
*/
String getProtocol();
/**
* Obtain the connection identifier for the network connection to the server that is being used for the
* {@code ServletRequest} from which this {@code ServletConnection} was obtained as defined by the protocol in use. Note
* that some protocols do not define such an identifier.
*
* Examples of protocol provided connection identifiers include:
*
* - HTTP 1.x
* - None, so the empty string should be returned
* - HTTP 2
* - None, so the empty string should be returned
* - HTTP 3
* - The QUIC connection ID
* - AJP
* - None, so the empty string should be returned
*
*
* @return The connection identifier if one is defined, otherwise an empty string
*/
String getProtocolConnectionId();
/**
* Determine whether or not the incoming network connection to the server used encryption or not. Note that where a
* reverse proxy is used, the application may have a different view as to whether encryption is being used due to the
* use of headers like {@code X-Forwarded-Proto}.
*
* @return {@code true} if the incoming network connection used encryption, otherwise {@code false}
*/
boolean isSecure();
}