A Debugging Web Server in Java

Description

EchoServer is a free HTTP server that generates an HTML document showing the HTTP request and headers sent to it. I use it widely for debugging FORM submissions and for checking what kind of HTTP headers are sent by various browsers in various circumstances, or if an applet or custom client is sending the proper HTTP headers.

It handles either GET or POST requests, and comes in single-threaded or multi-threaded versions. It runs in either Java 1.02 or 1.1. If compiling in 1.1, you can ignore the small number of "deprecation" warnings when compiling.

Source Code

ThreadedEchoServer. The multi-threaded server version; allows multiple simultaneous HTTP connections. Requires all of the classes below.
EchoServer. The basic debugging Web server on which the threaded version is built. Requires the NetworkServer and SocketUtil classes.
NetworkServer. A basic template for socket-based servers in Java, on which several programs (including the EchoServer) are built. Requires the SocketUtil class.
SocketUtil. A utility class that simplifies the creation of buffered and unbuffered I/O streams associated with sockets.

Core Web Programming

This code is extracted from Chapter 15 of Core Web Programming. For more info, see the reader reviews, the on-line ordering page, the table of contents, the source code archive (250+ Java classes, 200+ HTML/JavaScript docs presented in the book), and a sample chapter in HTML ("Graphical User Interface Controls" from the Java section).