Module jdk.httpserver

The com.sun.net.httpserver package defines a high-level API for building servers that support HTTP and HTTPS. The SimpleFileServer class implements a simple HTTP-only file server intended for testing, development and debugging purposes. A default implementation is provided via the jwebserver tool and the main entry point of the module, which can also be invoked with java -m jdk.httpserver.

The com.sun.net.httpserver.spi package specifies a Service Provider Interface (SPI) for locating HTTP server implementations based on the com.sun.net.httpserver API.

System properties used by the HTTP server API

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.

• sun.net.httpserver.idleInterval (default: 30 sec)
  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.

• jdk.httpserver.maxConnections (default: -1)
  The maximum number of open connections at a time. This includes active and idle connections. If zero or negative, then no limit is enforced.

• sun.net.httpserver.maxIdleConnections (default: 200)
  The maximum number of idle connections at a time. If set to zero or a negative value then connections are closed after use.

• sun.net.httpserver.drainAmount (default: 65536)
  The maximum number of bytes that will be automatically read and discarded from a request body that has not been completely consumed by its 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.

• sun.net.httpserver.maxReqHeaders (default: 200)
  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.

• sun.net.httpserver.maxReqHeaderSize (default: 393216 or 384kB)
  The maximum header field section size that the server is prepared to accept. This is computed as the sum of the size of the header name, plus the size of the header value, plus an overhead of 32 bytes for each field section line. The request line counts as a first field section line, where the name is empty and the value is the whole line. 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, there is no limit.

• sun.net.httpserver.maxReqTime (default: -1)
  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 IOException. This timer has an implementation specific granularity that may mean requests are aborted later than the specified interval.

• sun.net.httpserver.maxRspTime (default: -1)
  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 IOException. This timer has an implementation specific granularity that may mean responses are aborted later than the specified interval.

• sun.net.httpserver.nodelay (default: false)
  Boolean value, which if true, sets the TCP_NODELAY socket option on all incoming connections.