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- <h1>GoActions</h1>
- <p>The traditional Common Gateway Interface (CGI) is a slow technique for creating dynamic web pages
- because CGI processing results in the creation of a new process for every request. This is slow and cumbersome.
- GoAhead provides a high-performance replacement called GoActions™ that is a more suitable solution
- for embedded systems that demand compact and efficient solutions.</p>
- <p>GoActions are "C" language functions that are directly bound to specific URIs. They respond to client
- requests without creating a new process for each request. By sharing the address space with GoAhead, GoActions
- can directly access the full request context. GoActions are serviced by the <i>action</i> handler.</p>
- <h2>Defining GoActions</h2>
- <p>GoActions are defined by the
- <i><a href="../ref/api/goahead.html#group___webs_1gabadb35ad9084ca79783d0a63437d4959">websDefineAction</a></i> API.
- For example:</p>
- <pre class="ui code segment">
- static void buy(Webs *wp)
- {
- websSetStatus(wp, 200);
- websWriteHeaders(wp, 0, 0);
- websWriteEndHeaders(wp);
- websWrite(wp, "Name %s", websGetVar(wp, "name", ""));
- websWrite(wp, "Age %s", websGetVar(wp, "age", ""));
- websDone(wp);
- }
- <b>websDefineAction("buy", buy);</b>
- </pre>
- <h2>Calling GoActions</h2>
- <p>GoActions are bound to URIs that begin with <i>/action/</i>.
- When a client requests a URI <i>/action/NAME</i>, the action handler is invoked which then
- looks for a GoAction by NAME. The function bound to NAME is then is invoked to service the request. For
- example:</p>
- <pre class="ui code segment">
- /action/buy?name=John&item=candy
- </pre>
- <p>This will invoke the GoAction <i>buy</i> which will run the bound C function. The action handler will
- automatically decode the query string "name=John&age=30" and define GoAhead variables called "name" and "age".</p>
- <p>The GoAction is responsible for writing the HTTP header and HTML document content back to the user's
- browser.</p>
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