Sapper, a lightweight web framework, written in Rust.

Sapper focuses on easy of use. It is alpha now and only compiled with rust nightly.

Programming language: Rust
License: MIT License

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Sapper, a lightweight web framework, written in Rust.

Sapper focuses on ergonomic usage and rapid development. It can work with stable Rust.

Sapper now is based on hyper 0.10.13.


Look into json demo, you can learn how to parse http parameters, and return json;

Look into mvc diesel demo, you can learn how to use database, how to render template, and how to redirect.

English Tutorial



In Cargo.toml,

sapper = "0.1"

Basic Example

Now, you can boot the example server with:

cd examples/basic/
cargo build
cargo run

and open the browser, visit




or any other url to test it.

Other Examples

  1. tiny
  2. init_global
  3. query params
  4. body params
  5. session
  6. template rendering
  7. simple logger
  8. response json
  9. mvc diesel demo

  10. more continued...

Basic Benchmark

mike@mike-Vostro-3653:~/works2/wrk$ uname -a
Linux mike-Vostro-3653 4.10.0-21-generic #23-Ubuntu SMP Fri Apr 28 16:14:22 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

mike@mike-Vostro-3653:~/works2/wrk$ cat /proc/cpuinfo 
processor   : 0
vendor_id   : GenuineIntel
cpu family  : 6
model       : 94
model name  : Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz
cpu MHz     : 832.183
cache size  : 3072 KB
bogomips    : 7392.00

mike@mike-Vostro-3653:~/works2/sapper/examples/tiny$ cargo run --release
    Finished release [optimized] target(s) in 36.27 secs
     Running `target/release/tiny`
Listening on

output: hello, world!

mike@mike-Vostro-3653:~/works2/wrk$ ./wrk -t2 -c100 -d30s
Running 30s test @
  2 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    21.73us  139.92us  16.02ms   99.87%
    Req/Sec   235.94k    26.75k  259.73k    76.33%
  7045973 requests in 30.04s, 598.04MB read
Requests/sec: 234536.10
Transfer/sec:     19.91MB


  • Sapper supplies only basic framework;
  • Three level granularity (global, module, function handler) middleware controller and unified middleware presentation;
  • Typesafe abstraction, keep the same spirit with hyper;
  • For easy using, will supply some convenient macros to help write business logics;
  • Global object cross requests;


Typed, hierarchical control, and middlewares.


In Sapper, nearly every important thing is a Type. They are:

  • Each module is a type, different modules are different types;
  • Every middleware supplies some (0 to n) types for handler getting values;
  • Inherited from hyper's typed spirit, all headers, mime and so on should use types for manipulation.

Hierarchical Control

  • Sapper forces you to put router in each module (in main.rs, you can not write it, no space left for you to write);
  • Sapper forces you to seperate the router binding and the handler realization;
  • Sapper's plugin processor can be used in app level wrapper, module level wrapper, and each handler. These three level hierarchical controls make it flexible to construct your business.


Sapper's core contains only router system, request and response definitions, middleware system, and some other basic facilities. Nearly all practical features, such as query parameter, body parameter, cookie, session, json, xml, orm..., are supplied by the corresponding middlewares.

Sapper's middleware is very easy to write. One rust module realized a function on the prototype of

fn (&mut Request) -> Result<()>;  // before plugin
fn (&Request, &mut Response) -> Result<()>; // after plugin

can be thought as Sapper's middleware. Sample middleware: sapper_query.


  1. [X] QueryParams (x-www-form-urlencoded);
  2. [X] BodyParams (x-www-form-urlencoded);
  3. [X] BodyJsonParams;
  4. [X] Basic static file serving for dev;
  5. [X] Global object shared cross requests;
  6. [X] Macros;
  7. [ ] Multipart;


  • sapper_query parsing query string for req;
  • sapper_body parsing body parameters for req, including url form encoded, json type, json to struct macro;
  • sapper_logger record request and caculate its time;
  • sapper_session a cookie plugin, and else supply a helper set_cookie function;
  • sapper_tmpl use tera to render template;

Related Projects

Thanks to these projects below:

  • hyper Sapper is based on hyper mio branch;
  • iron Sapper learns many designs from iron;
  • router Sapper steals router about code from it;
  • recognizer Sapper uses this route recognizer;



*Note that all licence references and agreements mentioned in the Sapper README section above are relevant to that project's source code only.