http-cache.rs

What It Is

http-cache is a Rust HTTP response caching middleware library that implements RFC 7234 caching semantics based on http-cache-semantics. It covers both client-side and server-side use cases: on the client side, it can cache external API responses to reduce bandwidth usage, support offline access, and ease rate-limit pressure; on the server side, it can cache an application’s own responses to reduce database queries, expensive computation, and server load.

Core Capabilities

Functionally, it supports both traditional caching and streaming caching. Traditional caching fully buffers the response before storing it, making it suitable for smaller responses. Streaming caching does not require loading the full response into memory, which makes it better suited for large files, media content, or memory-constrained environments. However, the documentation states that streaming caching is currently supported only on the client side; the server side still uses buffered responses.

In terms of language and framework support, it targets Rust, with an MSRV of 1.88.0. Client integrations include reqwest, surf, ureq, and tower. On the server side, it supports the Tower ecosystem, including Axum, Hyper, and Tonic. Cache backend options are fairly extensive: cacache disk caching is enabled by default, while moka and quick_cache memory caches, foyer hybrid caching, and a streaming manager based on redb and raw disk files are also available.

Pricing and Usage

The source text does not mention commercial pricing or a hosted version. It can be installed with cargo add http-cache and links to GitHub, so it is best understood as an open-source Rust crate. One important note is that the documentation explicitly says most users probably will not use the core library directly unless they need to implement a custom cache backend or client middleware. In most cases, using the existing client implementations is the more common approach.

Pros, Cons, and Who It’s For

Its strengths include rigorous HTTP caching semantics, multiple backend choices, broad integration with the Rust HTTP ecosystem, and cache-aware rate limiting. Its drawbacks are that the abstraction is relatively low-level and may be difficult for typical application developers; server-side streaming caching is not yet available; and the Rust 1.88.0 MSRV may limit adoption in older projects. It is well suited to Rust backend engineers, framework or middleware authors, and API client or server projects that need standardized HTTP caching behavior.

Access from China

The source text does not provide information about the accessibility of the official site, GitHub, or crates.io from mainland China, so china_access can only be marked as unknown. If access to GitHub or crates.io is unstable, consider using domestic mirror sources, or implementing a simplified caching solution directly in the project based on components such as moka, cacache, or foyer.