[![Hex.pm version](https://img.shields.io/hexpm/v/machine_gun.svg)](https://hex.pm/packages/machine_gun)
[![Hex.pm downloads](https://img.shields.io/hexpm/dt/machine_gun.svg)](https://hex.pm/packages/machine_gun)
[![Build Status](https://travis-ci.org/petrohi/machine_gun.svg?branch=master)](https://travis-ci.org/petrohi/machine_gun)
# MachineGun
HTTP client for Elixir. Based on [Gun](https://github.com/ninenines/gun) and [Poolboy](https://github.com/devinus/poolboy).
* Supports HTTP/1 and HTTP/2 with automatic detection;
* Maintains separate connection pool for each pool_group:host:port combination;
* Allows per-pool configuration;
* Drop-in replacement for [HTTPoison](https://github.com/edgurgel/httpoison).
## Example
```
%MachineGun.Response{body: body, status_code: 200} =
MachineGun.get!(
"http://icanhazip.com",
[{"accept", "text/plain"}],
%{pool_timeout: 1000, request_timeout: 5000, pool_group: :default})
```
Options are included to show defaults and can be omitted. `pool_timeout` and `request_timeout` default to values specified in pool group configuration. If not specified in pool group configuration they default to the values in the example.
## Configuration
```
config :machine_gun,
# Default pool group
default: %{
pool_size: 4, # Poolboy size
pool_max_overflow: 4, # Poolboy max_overflow
pool_timeout: 1000,
request_timeout: 5000,
conn_opts: %{} # Gun connection options
}
```
Configuration example shows defaults and can be omitted. See [Poolboy options](https://github.com/devinus/poolboy#options) documentation for explanation of `pool_size` and `pool_max_overflow`. See [Gun manual](https://ninenines.eu/docs/en/gun/1.3/manual/gun/) for explanation of `conn_opts`.
## Notes
* When using MachineGun in a long-living process (for example genserver) make sure to handle messages in the form of `{ref, _}` tuples, which may be produced by pool [timeouts](https://hexdocs.pm/elixir/GenServer.html#call/3-timeouts).
* When using MachineGun with HTTP/2 and modern HTTP/1 servers we recommend using lowercase header names. For example `content-type`.
* MachineGun may timeout when request with empty body contains `content-type` header and does not contain `content-length` header. See [this issue](https://github.com/ninenines/gun/issues/141) for details.