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102 lines
4.2 KiB
Plaintext
102 lines
4.2 KiB
Plaintext
httpd.js README
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===============
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httpd.js is a small cross-platform implementation of an HTTP/1.1 server in
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JavaScript for the Mozilla platform.
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httpd.js may be used as an XPCOM component, as an inline script in a document
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with XPCOM privileges, or from the XPCOM shell (xpcshell). Currently, its most-
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supported method of use is from the XPCOM shell, where you can get all the
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dynamicity of JS in adding request handlers and the like, but component-based
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equivalent functionality is planned.
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Using httpd.js as an XPCOM Component
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------------------------------------
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First, create an XPT file for nsIHttpServer.idl, using the xpidl tool included
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in the Mozilla SDK for the environment in which you wish to run httpd.js. See
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<http://developer.mozilla.org/en/docs/XPIDL:xpidl> for further details on how to
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do this.
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Next, register httpd.js and nsIHttpServer.xpt in your Mozilla application. In
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Firefox, these simply need to be added to the /components directory of your XPI.
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Other applications may require use of regxpcom or other techniques; consult the
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applicable documentation for further details.
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Finally, create an instance of the server using the following command:
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var server = Components.classes["@mozilla.org/server/jshttp;1"]
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.createInstance(Components.interfaces.nsIHttpServer);
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At this point you'll want to initialize the server, since by default it doesn't
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serve many useful paths. For more information on this, see the IDL docs for the
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nsIHttpServer interface in nsIHttpServer.idl, particularly for
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registerDirectory (useful for mapping the contents of directories onto request
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paths), registerPathHandler (for setting a custom handler for a specific path on
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the server, such as CGI functionality), and registerFile (for mapping a file to
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a specific path).
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Finally, you'll want to start (and later stop) the server. Here's some example
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code which does this:
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server.start(8080); // port on which server will operate
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// ...server now runs and serves requests...
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server.stop();
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This server will only respond to requests on 127.0.0.1:8080 or localhost:8080.
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If you want it to respond to requests at different hosts (say via a proxy
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mechanism), you must use server.identity.add() or server.identity.setPrimary()
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to add it.
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Using httpd.js as an Inline Script or from xpcshell
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---------------------------------------------------
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Using httpd.js as a script or from xpcshell isn't very different from using it
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as a component; the only real difference lies in how you create an instance of
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the server. To create an instance, do the following:
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var server = new nsHttpServer();
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You now can use |server| exactly as you would when |server| was created as an
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XPCOM component. Note, however, that doing so will trample over the global
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namespace, and global values defined in httpd.js will leak into your script.
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This may typically be benign, but since some of the global values defined are
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constants (specifically, Cc/Ci/Cr as abbreviations for the classes, interfaces,
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and results properties of Components), it's possible this trampling could
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break your script. In general you should use httpd.js as an XPCOM component
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whenever possible.
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Known Issues
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------------
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httpd.js makes no effort to time out requests, beyond any the socket itself
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might or might not provide. I don't believe it provides any by default, but
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I haven't verified this.
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Every incoming request is processed by the corresponding request handler
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synchronously. In other words, once the first CRLFCRLF of a request is
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received, the entire response is created before any new incoming requests can be
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served. I anticipate adding asynchronous handler functionality in bug 396226,
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but it may be some time before that happens.
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There is no way to access the body of an incoming request. This problem is
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merely a symptom of the previous one, and they will probably both be addressed
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at the same time.
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Other Goodies
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-------------
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A special testing function, |server|, is provided for use in xpcshell for quick
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testing of the server; see the source code for details on its use. You don't
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want to use this in a script, however, because doing so will block until the
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server is shut down. It's also a good example of how to use the basic
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functionality of httpd.js, if you need one.
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Have fun!
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