/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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.
* <p>
* 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.
* <p>
* If the protocol has an entry in the <a href=
* "https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids">IANA
* registry for ALPN names</a> 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.
* <p>
* Examples of protocol provided connection identifiers include:
* <dl>
* <dt>HTTP 1.x</dt>
* <dd>None, so the empty string should be returned</dd>
* <dt>HTTP 2</dt>
* <dd>None, so the empty string should be returned</dd>
* <dt>HTTP 3</dt>
* <dd>The QUIC connection ID</dd>
* <dt>AJP</dt>
* <dd>None, so the empty string should be returned</dd>
* </dl>
*
* @return The connection identifier if one is defined, otherwise an empty string
*/
String getProtocolConnectionId();
/**
* Determine whether 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();
}