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The configuration parsing code is substantial, making this article inevitably lengthy. Therefore, please be prepared. Furthermore, since mail this module is rarely used in daily life, this article will only httpanalyze the configuration parsing process in specific application scenarios.
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Subrequests are a very important mechanism for request/response processing. Subrequests are also one of the most powerful aspects of nginx. With subrequests nginx can return the results from a different URL than the one the client originally requested. Some web frameworks call this an internal redirect.
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During a reload operation, Nginx received a SIGIO signal. In the previous post—while analyzing Nginx’s signal-handling code—I observed that when this signal is caught by Nginx, the signal handler merely sets the global variable ngx_sigio to 1, performing no other actions. Furthermore, this signal did not appear during reopen, quit, or stop operations…
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Key areas of focus: methods for calculating concurrent connections; methods for using shared memory; methods for using red-black trees; The ngx_http_limit_conn_module module is used to limit the number of connections per the defined key, in particular, the number of connections from a single IP address.
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In the Nginx configuration file, server {}multiple virtual hosts can be configured within a single virtual host location {}. locationWhat is their purpose?
