[erlang-questions] what is mochiweb for?

Alain O'Dea <>
Tue Jul 22 22:29:34 CEST 2008

To make a Java analogy, mochiweb is like Java EE Servlets for Erlang.  
It provides a container/servlet programming model similar to Java EE,  
but with much less overhead.

On 22-Jul-08, at 2:12 PM, Justin Sheehy wrote:

> On 7/22/08 12:13 PM, "Howard Yeh" <> wrote:
>> I've seen it mentioned and used in few places (couchdb), but I am
>> confused what niche it's designed for,  vs the inet library and yaws.
> You'd have to ask the mochi guys what it's designed for, but as
> a heavy user I can tell you some of what it's good for.
> I think of it as a programmable HTTP server layer.  The inet library
> is a handy library, but not really a fully capable Web server.
> Yaws, on the other hand, is closer to Apache -- very capable, but
> with many of its own ideas about how to build your Web systems.
> Mochiweb does the heavy lifting on your outward-facing HTTP
> connections, leaving you to write your application-specific
> server logic.  It provides useful abstractions over the request
> and response, and manages your client connections and other details
> of pushing data between your code and your clients.  It doesn't
> do too much for you beyond that, which is actually a plus;
> this means that it's straightforward to extend as part of another
> system.  If you want to stick with your original comparison,
> you might see it as a sweet spot or a local maximum in the
> spectrum between inets and yaws when it comes to building
> interesting Web applications.
> We've written an application (I am staying away from the term
> "framework" here) which uses mochiweb as the core HTTP engine
> but also automates the core logic of HTTP semantics that all
> Web apps should follow.  It then provides obvious, extensible
> places to connect with application-specific code.  We'll release
> that system -- "Webmachine" -- as open source when we get a
> bit of free time to package it up.
> -Justin
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