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When correctly deployed, caching is one of the quickest ways to accelerate web content.

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If the cache‑fill operation takes 30 seconds (as an example), but the delay between additional requests is less than this, the cache might never fill and NGINX would continue to send more and more requests for the entire file to the origin server.

NGINX offers two caching configurations that can be effective solutions for this problem: The following configuration triggers an immediate cache‑fill when the first byte‑range request is received, and forwards all other requests to the origin server while the cache‑fill operation is in progress: Because of the cache lock, subsequent requests for byte ranges are satisfied almost immediately while the cache is being filled.

The availability of globally distributed cloud platforms like AWS and DNS‑based global load balancing systems such as Route 53 make it possible to create your own global content delivery network (CDN).

In this article, we’ll look at how NGINX and NGINX Plus can cache and deliver traffic that is accessed using byte‑range requests.

NGINX forwards these requests to the origin server without trying to satisfy them from the cache: 192.1 - - [08/Dec/ -0800] "GET /10HTTP/1.0" 206 343 "-" "bytes=5000000-5000009" "curl/7.35.0" 192.1 - - [08/Dec/ -0800] "GET /10HTTP/1.0" 206 343 "-" "bytes=5000000-5000009" "curl/7.35.0" 192.1 - - [08/Dec/ -0800] "GET /10HTTP/1.0" 206 343 "-" "bytes=5000000-5000009" "curl/7.35.0" 192.1 - - [08/Dec/ -0800] "GET /10HTTP/1.0" 206 343 "-" "bytes=5000000-5000009" "curl/7.35.0" 192.1 - - [08/Dec/ -0800] "GET /10HTTP/1.0" 206 343 "-" "bytes=5000000-5000009" "curl/7.35.0" 192.1 - - [08/Dec/ -0800] "GET /10HTTP/1.0" 200 10486039 "-" "-" "curl/7.35.0" Using a cache lock optimizes the cache‑fill operation, but at the cost of sending all subsequent user traffic to the origin server during the cache‑fill period.

The Cache Slice module, introduced in NGINX Plus R8 and NGINX 1.9.8, offers an alternative method for filling the cache, which is more efficient when bandwidth is heavily constrained and cache‑fill operations take a long time.

We can demonstrate this behavior with this command: Every new request to the origin server triggers a new cache‑fill operation and the cache doesn’t “settle down” until a cache‑fill operation completes without other operations in progress.

Imagine a scenario where users start viewing a video file immediately after it is published.

It’s ideal for video resources where the initial cache‑fill operation might take several minutes because bandwidth is constrained, and the file does not change after publication.

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