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An HTTP module basics and configuration

In the previous article I explained how modules of all types link into Nginx. Now let’s  look closer at the specifics of HTTP modules. An HTTP module has the value NGX_HTTP_MODULE in its type field and the ctx field points to a global instance of a structure ngx_http_module_t:

How your module plugs into Nginx

In previous articles I have deliberately omitted almost everything related to the question of linking your module with Nginx. It is important, however, that you know about it. Let’s take a closer look at the metainformation that your module must contain, so that Nginx can initialise and configure it.

Working with cookies in a Nginx module

Imagine you run a PPC advertising campaign and you want to find out how many visitors coming from a search engine result in sales. We will create an Nginx module and use cookies for this purpose. Whenever a visitor clicks on your ad, a landing page is requested with a tracking argument in it. The […]

How to return a simple page

Let’s see what we need to do in order to return a simple page to a client using Nginx module. We need to generate a header and a body of the response. To send a response header we use function ngx_http_send_header: #include <ngx_http.h> ngx_int_t ngx_http_send_header(ngx_http_request_t *r); The only argument r is the request for which […]

HTTP request processing phases in Nginx

Nginx processes HTTP requests in multiple phases. In each of the phases there might be 0 or more handlers called. In the Nginx source code phases have specific constants associated with them. Here is a list of all phases: NGX_HTTP_SERVER_REWRITE_PHASE — the phase of request URI transformation on the virtual server level; NGX_HTTP_FIND_CONFIG_PHASE — the […]