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  1. JDK
  2. JDK-8295667

Document JDK specific system properties in jdk.httpserver

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    • CSR
    • Resolution: Approved
    • P4
    • 20
    • core-libs
    • None
    • behavioral
    • minimal
    • Hide
      The change is mostly just doc additions describing existing behavior. There is one behavior change in relation to the "sun.net.httpserver.maxReqHeaders" property. Currently, if this is set to zero or a negative value, then this effectively means all incoming requests will be rejected, which does not make sense. Now, the default value is specified to be used in that case.
      Show
      The change is mostly just doc additions describing existing behavior. There is one behavior change in relation to the "sun.net.httpserver.maxReqHeaders" property. Currently, if this is set to zero or a negative value, then this effectively means all incoming requests will be rejected, which does not make sense. Now, the default value is specified to be used in that case.
    • System or security property
    • JDK

    Description

      Summary

      Document existing system properties used by the JDK HTTP server (in the jdk.httpserver module).

      Problem

      There are several useful system properties for customising the behavior of the JDK's HTTP server, but they are only visible through the source code.

      Solution

      Document all relevant system properties in the jdk.httpserver module-info. Links to this description can then be provided from the online docs bundles.

      Specification

      Add the following text to src/jdk.httpserver/share/classes/module-info.java

       * <p>
       * <b id="httpserverprops">System properties used by the HTTP server API</b>
       * <p>
       * The following is a list of JDK specific system properties used by the default HTTP
       * server implementation in the JDK. Any properties below that take a numeric value
       * assume the default value if given a string that does not parse as a number.
       * <ul>
       * <li><p><b>{@systemProperty sun.net.httpserver.idleInterval}</b> (default: 30 sec)<br>
       * Maximum duration in seconds which an idle connection is kept open. This timer
       * has an implementation specific granularity that may mean that idle connections are
       * closed later than the specified interval. Values less than or equal to zero are mapped
       * to the default setting.
       * </li>
       * <li><p><b>{@systemProperty jdk.httpserver.maxConnections}</b> (default: -1)<br>
       * The maximum number of open connections at a time. This includes active and idle connections.
       * If zero or negative, then no limit is enforced.
       * </li>
       * <li><p><b>{@systemProperty sun.net.httpserver.maxIdleConnections}</b> (default: 200)<br>
       * The maximum number of idle connections at a time. If set to zero or a negative value
       * then connections are closed after use.
       * </li>
       * <li><p><b>{@systemProperty sun.net.httpserver.drainAmount}</b> (default: 65536)<br>
       * The maximum number of bytes that will be automatically read and discarded from a
       * request body that has not been completely consumed by its
       * {@link com.sun.net.httpserver.HttpHandler HttpHandler}. If the number of remaining
       * unread bytes are less than this limit then the connection will be put in the idle connection
       * cache. If not, then it will be closed.
       * </li>
       * <li><p><b>{@systemProperty sun.net.httpserver.maxReqHeaders}</b> (default: 200)<br>
       * The maxiumum number of header fields accepted in a request. If this limit is exceeded
       * while the headers are being read, then the connection is terminated and the request ignored.
       * If the value is less than or equal to zero, then the default value is used.
       * </li>
       * <li><p><b>{@systemProperty sun.net.httpserver.maxReqTime}</b> (default: -1)<br>
       * The maximum time in milliseconds allowed to receive a request headers and body.
       * In practice, the actual time is a function of request size, network speed, and handler
       * processing delays. A value less than or equal to zero means the time is not limited.
       * If the limit is exceeded then the connection is terminated and the handler will receive a
       * {@link java.io.IOException}. This timer has an implementation specific granularity
       * that may mean requests are aborted later than the specified interval.
       * </li>
       * <li><p><b>{@systemProperty sun.net.httpserver.maxRspTime}</b> (default: -1)<br>
       * The maximum time in milliseconds allowed to receive a response headers and body.
       * In practice, the actual time is a function of response size, network speed, and handler
       * processing delays. A value less than or equal to zero means the time is not limited.
       * If the limit is exceeded then the connection is terminated and the handler will receive a
       * {@link java.io.IOException}. This timer has an implementation specific granularity
       * that may mean responses are aborted later than the specified interval.
       * </li>
       * <li><p><b>{@systemProperty sun.net.httpserver.nodelay}</b> (default: false)<br>
       * Boolean value, which if true, sets the {@link java.net.StandardSocketOptions#TCP_NODELAY TCP_NODELAY}
       * socket option on all incoming connections.
       * </li></ul>

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              michaelm Michael McMahon
              michaelm Michael McMahon
              Daniel Fuchs
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                Created:
                Updated:
                Resolved: