![]() ![]() Nginx can perform caching at different level: URL path, single website, or globally throughout all websites / web apps served by Nginx. Similary, when Nginx is running as a web server, there will be less time waiting for processing a request that returns dynamic content. When Nginx is configured as a reverse proxy, as for example, content caching improves content delivery speed since there will be less round trips made to the upstream server for proxying the same requests. ![]() Caching the content improves the user-perceived performance especially on the latency side. Content caching is usually combined with other type of Nginx setup, such as reverse proxy or web server. ![]() If you add the following condition in the location block of the nginx virtual host configuration file, the server will only allow GET, HEAD, and POST methods and will filter out methods such as DELETE and TRACE.It is important to note that even though mail protocols (SMTP, IMAP, and POP) are used when sending or retrieving emails, Nginx authenticates the mail server user through HTTP-based authentication.Ĭontent caching is a mechanism to store static or dynamic content returned as responses of a request in a temporary storage (cache) so that the same request in the future can be served with the content directly from the cache. We suggest that you disable any HTTP methods, which are not going to be utilized and which are not required to be implemented on the web server. Note: Some sources suggest that setting such limits may prevent potential buffer overflow attacks if such vulnerabilities are found in nginx. This directive will accept 2 kB data URI. A large_client_header_buffers 2 1k directive sets the maximum number of buffers to 2, each with a maximum size of 1k. large_client_header_buffers – use this directive to specify the maximum number and size of buffers to be used to read large client request headers.A 1k directive should be sufficient but you need to increase it if you are receiving file uploads via the POST method. client_max_body_size – use this directive to specify the maximum accepted body size for a client request.A buffer size of 1k is adequate for most requests. client_header_buffer_size – use this directive to specify the header buffer size for the client request header.The default value is 8k or 16k but it is recommended to set this as low as 1k: client_body_buffer_size 1k. client_body_buffer_size – use this directive to specify the client request body buffer size. ![]() You can do this in the nginx configuration file using the following directives: To prevent potential DoS attacks on nginx, you can set buffer size limitations for all clients. You should disable the server_tokens directive in the nginx configuration file by setting server_tokens off. This could lead to information disclosure – an unauthorized user could gain knowledge about the version of nginx that you use. It is directly visible in all automatically generated error pages but also present in all HTTP responses in the Server header. configure -without-http_autoindex_moduleīy default, the server_tokens directive in nginx displays the nginx version number. In the example below, we disable the autoindex module, which generates automatic directory listings, and then recompile nginx. To do this, use the configure option during installation. We recommend that you disable any modules that are not required as this will minimize the risk of potential attacks by limiting allowed operations. To disable certain modules, you need to recompile nginx. Currently, you cannot choose modules at runtime. When you install nginx, it automatically includes many modules. You may also need to do some changes to virtual host configuration files, typically contained in the sites-available subdirectory. By default, you can find nf in /conf on Windows systems, and in /etc/nginx or /usr/local/etc/nginx on Linux systems. This is the main configuration file for nginx and therefore most security checks will be done using this file. In this article, we will provide tips on nginx server security, showing you how to secure your nginx installation.Īfter installing nginx, you should gain a good understanding of its configuration settings, which are found in the nf file. An nginx server can easily handle 10,000 inactive HTTP connections with as little as 2.5 MB of memory. It is the web server of choice for Netflix,, and other high traffic sites. It is lightweight, fast, robust, and supports all major operating systems. Currently, nginx is the most popular web server, recently beating Apache. ![]()
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