Nginx etag cache. We recommend that you use cache slicing only for large files that do not change once published, such as video files. Oct 24, 2025 · Fine-tuning Nginx cache headers for browser caching is a critical step in optimizing your website’s performance. The point of a reverse proxy is to speed things up by not connecting to the upstreadm every time. This allow efficient caching by providing the client a method to check for a new version before downloading. You can use this module to add any arbitrary headers to the response, but its major role is to… Learn how to set an expiration time for an Nginx proxy cache. The version 1. Further Reading There are many more ways you can customize and tune NGINX caching. . Nginx’s header module can help you accomplish browser caching. It lets caches be more efficient and save bandwidth, as a web server does not need to resend a full response if the content has not changed. Additionally, ETags help to prevent simultaneous updates of a resource from overwriting each other ("mid-air collisions"). Only two directives are needed to enable basic caching: proxy_cache_path and proxy_cache. expires @15h30m; The contents of the “Cache-Control” field depends on the sign of the specified time: time is negative — “Cache-Control: no-cache”. 3. 3 supports a directive etag on the ngx_http_core_module, which means NGINX will automatically generate an ETag header for static contents. Oct 31, 2024 · In this guide we’ll dive into how to set up NGINX to serve static files with cache headers, including how to use Etag headers and cache files selectively with hashed filenames. Here we look at some key cache scenarios and recommend the ideal headers to set. By implementing the techniques outlined in this tutorial, you can significantly reduce server load, improve page load times, and enhance user experience. Nov 16, 2024 · NGINX is an HTTP web server widely used for load balancing, content caching, and reverse proxing. The next section discusses how to configure basic caching with NGINX. To learn even more about caching with NGINX, please take a look at the following resources: The ngx_http_proxy_module reference documentation contains all of the configuration options for content caching. Caching headers are surprisingly complex and often misconfigured. Aug 10, 2023 · By combining the expiration-based caching mechanism of Cache-Control with the validation-based approach of ETag, developers can ensure that a client doesn't even attempt to re-fetch a resource until necessary, but when it does, it's validated for freshness. Summary The HTTP ETag (entity tag) response header is an identifier for a specific version of a resource. Primary Cache Headers Cache-Control: The most important modern caching header that defines caching policies Expires: Sets a specific date/time when content becomes stale ETag: A unique identifier for a specific version of a resource Last-Modified: Indicates when the resource was last changed How Caching Works When a browser requests a resource: I'm using Nginx as a webserver and want to implement a browser caching method so that the users keep copies of static, unchanged files locally and download only changed files. The module verifies the resource’s ETag header each time it receives a segment from the origin, and if the ETag changes, NGINX aborts the transaction because the underlying cached version is now corrupt. I'm using Nginx as a webserver and want to implement a browser caching method so that the users keep copies of static, unchanged files locally and download only changed files. In this post I'll show how you can add caching headers to the files served by the StaticFileMiddleware to increase your site's performance. One of the propositio 8 Etags alone will not help you. Nginx will not hit the upstream if it finds the resource in its cache. Etag is used for conditional requests by the client (browser), to control its own cache. HTTP协议的Cache -Control指定请求和响应遵循的缓存机制。在请求消息或响应消息中设置 Cache-Control并不会影响另一个消息处理过程中的缓存处理过程。请求时的缓存指令包括: no-cache、no-store、max-age、 max-stale、min-fresh、only- Nginx’s header module can help you accomplish browser caching. time is positive or zero — “Cache-Control: max-age= t ”, where t is a time specified in the directive, in seconds. Find out how different headers influence browser cache, how they relate to proxy servers, and how popular services created in React serve their web apps. You can use this module to add any arbitrary headers to the response, but its major role is to… Here is a good overview of the Vary header. Oct 20, 2025 · An ETag (Entity Tag) is an HTTP response header that identifies a version of a resource. Jul 23, 2015 · NGINX is commonly deployed as a reverse proxy or load balancer in an application stack and has a full set of caching features. wgaf8, rt3x, nv4gbi, srrpu3, hunbd, rjyrp, nxl8r, mwpy, kdtd, g5oucv,