http/af is a high-performance, memory-efficient, and scalable web server for
OCaml. It implements the HTTP 1.1 specification with respect to parsing,
serialization, and connection pipelining as a state machine that is agnostic to
the underlying IO mechanism, and is therefore portable across many platform.
It uses the Angstrom and Faraday libraries to implement
the parsing and serialization layers of the HTTP standard, hence the name.

Installation

Install the library and its dependencies via OPAM:

opam install httpaf

Performance

The reason for http/af's existence is mirage/ocaml-cohttp#328, which
highlights the poor scalability of cohttp. This is due to a number of factors,
including poor scheduling, excessive allocation, and starvation of the server's
accept loop. Here is a comparison chart of the data from that issue, along with
data from an async-based http/af server. This server was run on a VM with 3
virtual cores, the host being circa 2015 MacBook Pro:

The http/af latency histogram, relative to the cohttp histograms, is pretty
much flat along the x-axis. Here are some additional statistics from that run
(with latencies in milliseconds):

#[Mean    =       27.719, StdDeviation   =       31.570]
#[Max     =      263.424, Total count    =      1312140]
#[Buckets =           27, SubBuckets     =         2048]
----------------------------------------------------------
  1709909 requests in 1.00m, 3.33GB read

Usage

WIP

Development

To install development dependencies, pin the package from the root of the
repository:

opam pin add -n httpaf .
opam install --deps-only httpaf

After this, you may install a development version of the library using the
install command as usual.

Tests can be run via jbuilder:

jbuilder runtest

License

BSD3, see LICENSE files for its text.