Multipart Build Status On

Client- and server-side abstractions for HTTP file uploads (POST requests with Content-Type: multipart/form-data).

Supports several different (synchronous API) HTTP crates. Asynchronous (i.e. futures-based) API support will be provided by multipart-async.

Minimum supported Rust version: 1.22.1*

  • only mock, client and server features, only guaranteed to compile

Fully tested Rust version: 1.26.1



Example files demonstrating how to use multipart with these crates are available under examples/.


via the hyper feature (enabled by default).

Note: Hyper 0.9, 0.10 (synchronous API) only; support for asynchronous APIs will be provided by multipart-async.

Client integration includes support for regular hyper::client::Request objects via multipart::client::Multipart, as well as integration with the new hyper::Client API via multipart::client::lazy::Multipart (new in 0.5).

Server integration for hyper::server::Request via multipart::server::Multipart.


via the iron feature.

Provides regular server-side integration with iron::Request via multipart::server::Multipart, as well as a convenient BeforeMiddleware implementation in multipart::server::iron::Intercept.

Nickel returning to multipart in 0.14!

via the nickel feature.

Provides server-side integration with &mut nickel::Request via multipart::server::Multipart.


via the tiny_http feature.

Provides server-side integration with tiny_http::Request via multipart::server::Multipart.


Direct integration is not provided as the Rocket folks seem to want to handle multipart/form-data behind the scenes which would supercede any integration with multipart. However, an example is available showing how to use multipart on a Rocket server: examples/

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Customizable drop-in std::io::BufReader replacement, created to be used in this crate. Needed because it can read more bytes into the buffer without the buffer being empty, necessary when a boundary falls across two reads. (It was easier to author a new crate than try to get this added to std::io::BufReader.)


Fast, zero-copy HTTP header parsing, used to read field headers in multipart/form-data request bodies.


Fast string and byte-string search. Used to find boundaries in the request body. SSE 4.2 acceleration available under the sse42 or twoway/pcmp features.


Licensed under either of

at your option.


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.