jwebserver-java-20 - Man Page
launch the Java Simple Web Server
Command-line options. For a detailed description of the options, see Options.
jwebserver tool provides a minimal HTTP server, designed to be used for prototyping, testing, and debugging. It serves a single directory hierarchy, and only serves static files. Only HTTP/1.1 is supported; HTTP/2 and HTTPS are not supported.
Only idempotent HEAD and GET requests are served. Any other requests receive a
501 - Not Implemented or a
405 - Not Allowed response. GET requests are mapped to the directory being served, as follows:
- If the requested resource is a file, its content is served.
- If the requested resource is a directory that contains an index file, the content of the index file is served.
- Otherwise, the names of all files and subdirectories of the directory are listed. Symbolic links and hidden files are not listed or served.
MIME types are configured automatically, using the built-in table. For example,
.html files are served as
.java files are served as
jwebserver is located in the jdk.httpserver module, and can alternatively be started with
java -m jdk.httpserver. It is based on the web server implementation in the
com.sun.net.httpserver package. The
com.sun.net.httpserver.SimpleFileServer class provides a programmatic way to retrieve the server and its components for reuse and extension.
jwebserver [-b bind address] [-p port] [-d directory] [-o none|info|verbose] [-h to show options] [-version to show version information]
- -h or -? or --help
Prints the help message and exits.
- -b addr or --bind-address addr
Specifies the address to bind to. Default: 127.0.0.1 or ::1 (loopback). For all interfaces use
- -d dir or --directory dir
Specifies the directory to serve. Default: current directory.
- -o level or --output level
Specifies the output format.
- -p port or --port port
Specifies the port to listen on. Default: 8000.
- -version or --version
Prints the version information and exits.
To stop the server, press
Ctrl + C.
Starting the Server
The following command starts the Simple Web Server:
If startup is successful, the server prints a message to
System.out listing the local address and the absolute path of the directory being served. For example:
$ jwebserver Binding to loopback by default. For all interfaces use "-b 0.0.0.0" or "-b ::". Serving /cwd and subdirectories on 127.0.0.1 port 8000 URL http://127.0.0.1:8000/
By default, the server runs in the foreground and binds to the loopback address and port 8000. This can be changed with the
-p options. For example, to bind the Simple Web Server to all interfaces, use:
$ jwebserver -b 0.0.0.0 Serving /cwd and subdirectories on 0.0.0.0 (all interfaces) port 8000 URL http://123.456.7.891:8000/
Note that this makes the web server accessible to all hosts on the network. Do not do this unless you are sure the server cannot leak any sensitive information.
As another example, use the following command to run on port 9000:
$ jwebserver -p 9000
By default, the files of the current directory are served. A different directory can be specified with the
By default, every request is logged on the console. The output looks like this:
127.0.0.1 - - [10/Feb/2021:14:34:11 +0000] "GET /some/subdirectory/ HTTP/1.1" 200 -
Logging output can be changed with the
-o option. The default setting is
verbose setting additionally includes the request and response headers as well as the absolute path of the requested resource.
Stopping the Server
Once started successfully, the server runs until it is stopped. On Unix platforms, the server can be stopped by sending it a
SIGINT signal (
Ctrl+C in a terminal window).
-h option displays a help message describing the usage and the options of the