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	diff --git a/lib/tesla.ex b/lib/tesla.ex
	index a800667..9a07382 100644
	--- a/lib/tesla.ex
	+++ b/lib/tesla.ex
	@@ -1,236 +1,237 @@
	defmodule Tesla.Error do
	defexception message: "", reason: nil
	end

	defmodule Tesla.Env do
	@type client :: Tesla.Client.t() \| (t, stack -> t)
	@type method :: :head \| :get \| :delete \| :trace \| :options \| :post \| :put \| :patch
	@type url :: binary
	@type param :: binary \| [{binary \| atom, param}]
	@type query :: [{binary \| atom, param}]
	@type headers :: [{binary, binary}]

	@type body :: any
	@type status :: integer
	@type opts :: [any]

	@type stack :: [{atom, atom, any} \| {atom, atom} \| {:fn, (t -> t)} \| {:fn, (t, stack -> t)}]

	@type t :: %__MODULE__{
	method: method,
	query: query,
	url: url,
	headers: headers,
	body: body,
	status: status,
	opts: opts,
	__module__: atom,
	__client__: client
	}

	defstruct method: nil,
	url: "",
	query: [],
	headers: [],
	body: nil,
	status: nil,
	opts: [],
	__module__: nil,
	__client__: nil
	end

	defmodule Tesla.Client do
	@type t :: %__MODULE__{
	fun: (Tesla.Env.t(), Tesla.Env.stack() -> Tesla.Env.t()) \| nil,
	pre: Tesla.Env.stack(),
	post: Tesla.Env.stack()
	}
	defstruct fun: nil,
	pre: [],
	post: []
	end

	defmodule Tesla.Middleware do
	- @callback call(env :: Tesla.Env.t(), next :: Tesla.Env.stack(), options :: any) :: {:ok, Tesla.Env.t()} \| {:error, any}
	+ @callback call(env :: Tesla.Env.t(), next :: Tesla.Env.stack(), options :: any) ::
	+ {:ok, Tesla.Env.t()} \| {:error, any}
	end

	defmodule Tesla.Adapter do
	@callback call(env :: Tesla.Env.t(), options :: any) :: {:ok, Tesla.Env.t()} \| {:error, any}
	end

	defmodule Tesla do
	use Tesla.Builder

	alias Tesla.Env

	require Tesla.Adapter.Httpc
	@default_adapter Tesla.Adapter.Httpc

	@moduledoc """
	A HTTP toolkit for building API clients using middlewares

	Include Tesla module in your api client:

	```ex
	defmodule ExampleApi do
	use Tesla

	plug Tesla.Middleware.BaseUrl, "http://api.example.com"
	plug Tesla.Middleware.JSON
	end
	"""

	defmacro __using__(opts \\ []) do
	quote do
	use Tesla.Builder, unquote(opts)
	end
	end

	@doc false
	def execute(module, %{fun: fun, pre: pre, post: post} = client, options) do
	env = struct(Env, options ++ [__module__: module, __client__: client])
	stack = pre ++ wrapfun(fun) ++ module.__middleware__ ++ post ++ [effective_adapter(module)]
	run(env, stack)
	end

	defp wrapfun(nil), do: []
	defp wrapfun(fun), do: [{:fn, fun}]

	@doc false
	def effective_adapter(module) do
	with nil <- adapter_per_module_from_config(module),
	nil <- adapter_per_module(module),
	nil <- adapter_from_config() do
	adapter_default()
	end
	end

	defp adapter_per_module_from_config(module) do
	case Application.get_env(:tesla, module, [])[:adapter] do
	nil -> nil
	{adapter, opts} -> {adapter, :call, [opts]}
	adapter -> {adapter, :call, [[]]}
	end
	end

	defp adapter_per_module(module) do
	module.__adapter__
	end

	defp adapter_from_config do
	case Application.get_env(:tesla, :adapter) do
	nil -> nil
	{adapter, opts} -> {adapter, :call, [opts]}
	adapter -> {adapter, :call, [[]]}
	end
	end

	defp adapter_default do
	{@default_adapter, :call, [[]]}
	end

	def run_default_adapter(env, opts \\ []) do
	apply(@default_adapter, :call, [env, opts])
	end

	# empty stack case is useful for reusing/testing middlewares (just pass [] as next)
	def run(env, []), do: {:ok, env}

	# last item in stack is adapter - skip passing rest of stack
	def run(env, [{:fn, f}]), do: apply(f, [env])
	def run(env, [{m, f, a}]), do: apply(m, f, [env \| a])

	# for all other elements pass (env, next, opts)
	def run(env, [{:fn, f} \| rest]), do: apply(f, [env, rest])
	def run(env, [{m, f, a} \| rest]), do: apply(m, f, [env, rest \| a])

	# useful helper fuctions
	def put_opt(env, key, value) do
	Map.update!(env, :opts, &Keyword.put(&1, key, value))
	end

	@spec get_header(Env.t(), binary) :: binary \| nil
	def get_header(%Env{headers: headers}, key) do
	case List.keyfind(headers, key, 0) do
	{_, value} -> value
	_ -> nil
	end
	end

	@spec get_headers(Env.t(), binary) :: [binary]
	def get_headers(%Env{headers: headers}, key) do
	for {k, v} <- headers, k == key, do: v
	end

	@spec put_header(Env.t(), binary, binary) :: Env.t()
	def put_header(%Env{} = env, key, value) do
	headers = List.keystore(env.headers, key, 0, {key, value})
	%{env \| headers: headers}
	end

	@spec put_headers(Env.t(), [{binary, binary}]) :: Env.t()
	def put_headers(%Env{} = env, list) when is_list(list) do
	%{env \| headers: env.headers ++ list}
	end

	@spec delete_header(Env.t(), binary) :: Env.t()
	def delete_header(%Env{} = env, key) do
	headers = for {k, v} <- env.headers, k != key, do: {k, v}
	%{env \| headers: headers}
	end

	@spec put_body(Env.t(), Env.body()) :: Env.t()
	def put_body(%Env{} = env, body), do: %{env \| body: body}

	@doc """
	Dynamically build client from list of middlewares.

	```ex
	defmodule ExampleAPI do
	use Tesla

	def new(token) do
	Tesla.build_client([
	{Tesla.Middleware.Headers, %{"Authorization" => token}}
	])
	end
	end

	client = ExampleAPI.new(token: "abc")
	client \|> ExampleAPI.get("/me")
	```
	"""
	defmacro build_client(pre, post \\ []) do
	quote do
	require Tesla.Builder
	Tesla.Builder.client(unquote(pre), unquote(post))
	end
	end

	def build_adapter(fun) do
	%Tesla.Client{post: [{:fn, fn env, _next -> fun.(env) end}]}
	end

	def build_url(url, []), do: url

	def build_url(url, query) do
	join = if String.contains?(url, "?"), do: "&", else: "?"
	url <> join <> encode_query(query)
	end

	defp encode_query(query) do
	query
	\|> Enum.flat_map(&encode_pair/1)
	\|> URI.encode_query()
	end

	defp encode_pair({key, value}) when is_list(value) do
	if Keyword.keyword?(value) do
	Enum.flat_map(value, fn {k, v} -> encode_pair({"#{key}[#{k}]", v}) end)
	else
	Enum.map(value, fn e -> {"#{key}[]", e} end)
	end
	end

	defp encode_pair({key, value}), do: [{key, value}]
	end
	diff --git a/lib/tesla/adapter/ibrowse.ex b/lib/tesla/adapter/ibrowse.ex
	index dcf2861..4166831 100644
	--- a/lib/tesla/adapter/ibrowse.ex
	+++ b/lib/tesla/adapter/ibrowse.ex
	@@ -1,95 +1,96 @@
	if Code.ensure_loaded?(:ibrowse) do
	defmodule Tesla.Adapter.Ibrowse do
	@moduledoc """
	Adapter for [ibrowse](https://github.com/cmullaparthi/ibrowse)

	Remember to add `{:ibrowse, "~> 4.2"}` to dependencies (and `:ibrowse` to applications in `mix.exs`)
	Also, you need to recompile tesla after adding `:ibrowse` dependency:

	```
	mix deps.clean tesla
	mix deps.compile tesla
	```

	### Example usage
	```
	# set globally in config/config.exs
	config :tesla, :adapter, :ibrowse

	# set per module
	defmodule MyClient do
	use Tesla

	adapter :ibrowse
	end
	```
	"""

	@behaviour Tesla.Adapter
	import Tesla.Adapter.Shared, only: [stream_to_fun: 1, next_chunk: 1]
	alias Tesla.Multipart

	def call(env, opts) do
	with {:ok, status, headers, body} <- request(env, opts \|\| []) do
	- {:ok, %{
	- env
	- \| status: format_status(status),
	- headers: format_headers(headers),
	- body: format_body(body)
	- }}
	+ {:ok,
	+ %{
	+ env
	+ \| status: format_status(status),
	+ headers: format_headers(headers),
	+ body: format_body(body)
	+ }}
	end
	end

	defp format_status(status) when is_list(status) do
	status \|> to_string() \|> String.to_integer()
	end

	defp format_headers(headers) do
	for {key, value} <- headers do
	{String.downcase(to_string(key)), to_string(value)}
	end
	end

	defp format_body(data) when is_list(data), do: IO.iodata_to_binary(data)
	defp format_body(data) when is_binary(data), do: data

	defp request(env, opts) do
	body = env.body \|\| []

	handle(
	request(
	Tesla.build_url(env.url, env.query) \|> to_charlist,
	env.headers,
	env.method,
	body,
	opts ++ env.opts
	)
	)
	end

	defp request(url, headers, method, %Multipart{} = mp, opts) do
	headers = headers ++ Multipart.headers(mp)
	body = stream_to_fun(Multipart.body(mp))

	request(url, headers, method, body, opts)
	end

	defp request(url, headers, method, %Stream{} = body, opts) do
	fun = stream_to_fun(body)
	request(url, headers, method, fun, opts)
	end

	defp request(url, headers, method, body, opts) when is_function(body) do
	body = {&next_chunk/1, body}
	opts = Keyword.put(opts, :transfer_encoding, :chunked)
	request(url, headers, method, body, opts)
	end

	defp request(url, headers, method, body, opts) do
	:ibrowse.send_req(url, headers, method, body, opts)
	end

	defp handle({:error, {:conn_failed, error}}), do: error
	defp handle(response), do: response
	end
	end
	diff --git a/lib/tesla/middleware/compression.ex b/lib/tesla/middleware/compression.ex
	index a4f5fd1..134f030 100644
	--- a/lib/tesla/middleware/compression.ex
	+++ b/lib/tesla/middleware/compression.ex
	@@ -1,94 +1,95 @@
	defmodule Tesla.Middleware.Compression do
	@behaviour Tesla.Middleware

	@moduledoc """
	Compress requests and decompress responses.

	Supports "gizp" and "deflate" encodings using erlang's built-in `:zlib` module.

	### Example usage
	```
	defmodule MyClient do
	use Tesla

	plug Tesla.Middleware.Compression, format: "gzip"
	end
	```

	### Options
	- `:format` - request compression format, `"gzip"` (default) or `"defalte"`
	"""

	def call(env, next, opts) do
	env
	\|> compress(opts)
	\|> Tesla.run(next)
	\|> decompress()
	end

	defp compressable?(body), do: is_binary(body)

	@doc """
	Compress request, used by `Tesla.Middleware.CompressRequest`
	"""
	def compress(env, opts) do
	if compressable?(env.body) do
	format = Keyword.get(opts \|\| [], :format, "gzip")

	env
	\|> Tesla.put_body(compress_body(env.body, format))
	\|> Tesla.put_headers([{"content-encoding", format}])
	else
	env
	end
	end

	defp compress_body(body, "gzip"), do: :zlib.gzip(body)
	defp compress_body(body, "deflate"), do: :zlib.zip(body)

	@doc """
	Decompress response, used by `Tesla.Middleware.DecompressResponse`
	"""
	def decompress({:ok, env}), do: {:ok, decompress(env)}
	def decompress({:error, reasonn}), do: {:error, reasonn}
	+
	def decompress(env) do
	env
	\|> Tesla.put_body(decompress_body(env.body, Tesla.get_header(env, "content-encoding")))
	end

	defp decompress_body(<<31, 139, 8, _::binary>> = body, "gzip"), do: :zlib.gunzip(body)
	defp decompress_body(body, "deflate"), do: :zlib.unzip(body)
	defp decompress_body(body, _content_encoding), do: body
	end

	defmodule Tesla.Middleware.CompressRequest do
	@behaviour Tesla.Middleware

	@moduledoc """
	Only compress request.

	See `Tesla.Middleware.Compression` for options.
	"""

	def call(env, next, opts) do
	env
	\|> Tesla.Middleware.Compression.compress(opts)
	\|> Tesla.run(next)
	end
	end

	defmodule Tesla.Middleware.DecompressResponse do
	@behaviour Tesla.Middleware

	@moduledoc """
	Only decompress response.

	See `Tesla.Middleware.Compression` for options.
	"""

	def call(env, next, _opts) do
	env
	\|> Tesla.run(next)
	\|> Tesla.Middleware.Compression.decompress()
	end
	end
	diff --git a/lib/tesla/middleware/decode_rels.ex b/lib/tesla/middleware/decode_rels.ex
	index 1385fc5..a4b6ecb 100644
	--- a/lib/tesla/middleware/decode_rels.ex
	+++ b/lib/tesla/middleware/decode_rels.ex
	@@ -1,51 +1,52 @@
	defmodule Tesla.Middleware.DecodeRels do
	@behaviour Tesla.Middleware

	@moduledoc """
	Decode `Link` Hypermedia HTTP header into `opts[:rels]` field in response.


	### Example usage
	```
	defmodule MyClient do
	use Tesla

	plug Tesla.Middleware.DecodeRels
	end

	env = MyClient.get("/...")
	env.opts[:rels] # => %{"Next" => "http://...", "Prev" => "..."}
	```

	"""

	def call(env, next, _opts) do
	env
	\|> Tesla.run(next)
	\|> parse_rels
	end

	defp parse_rels({:ok, env}), do: {:ok, parse_rels(env)}
	defp parse_rels({:error, reason}), do: {:error, reason}
	+
	defp parse_rels(env) do
	if link = Tesla.get_header(env, "link") do
	Tesla.put_opt(env, :rels, rels(link))
	else
	env
	end
	end

	defp rels(link) do
	link
	\|> String.split(",")
	\|> Enum.map(&String.trim/1)
	\|> Enum.map(&rel/1)
	\|> Enum.into(%{})
	end

	defp rel(item) do
	Regex.run(~r/\A<(.+)>; rel="(.+)"\z/, item, capture: :all_but_first)
	\|> Enum.reverse()
	\|> List.to_tuple()
	end
	end
	diff --git a/lib/tesla/middleware/follow_redirects.ex b/lib/tesla/middleware/follow_redirects.ex
	index ba62a9b..ad74925 100644
	--- a/lib/tesla/middleware/follow_redirects.ex
	+++ b/lib/tesla/middleware/follow_redirects.ex
	@@ -1,67 +1,68 @@
	defmodule Tesla.Middleware.FollowRedirects do
	@behaviour Tesla.Middleware

	@moduledoc """
	Follow 3xx redirects

	### Example
	```
	defmodule MyClient do
	use Tesla

	plug Tesla.Middleware.FollowRedirects, max_redirects: 3 # defaults to 5
	end
	```

	### Options
	- `:max_redirects` - limit number of redirects (default: `5`)

	"""

	@max_redirects 5
	@redirect_statuses [301, 302, 307, 308]

	def call(env, next, opts \\ []) do
	max = Keyword.get(opts \|\| [], :max_redirects, @max_redirects)

	redirect(env, next, max)
	end

	defp redirect(env, next, left) when left == 0 do
	case Tesla.run(env, next) do
	- {:ok, %{status: status} = env} when not status in @redirect_statuses ->
	+ {:ok, %{status: status} = env} when not (status in @redirect_statuses) ->
	{:ok, env}

	{:ok, env} ->
	{:error, {__MODULE__, :too_many_redirects}}

	error ->
	error
	end
	end

	defp redirect(env, next, left) do
	case Tesla.run(env, next) do
	{:ok, %{status: status} = env} when status in @redirect_statuses ->
	case Tesla.get_header(env, "location") do
	nil ->
	{:ok, env}
	+
	location ->
	location = parse_location(location, env)
	redirect(%{env \| url: location}, next, left - 1)
	end

	other ->
	other
	end
	end

	defp parse_location("/" <> _rest = location, env) do
	env.url
	\|> URI.parse()
	\|> URI.merge(location)
	\|> URI.to_string()
	end

	defp parse_location(location, _env), do: location
	end
	diff --git a/lib/tesla/middleware/fuse.ex b/lib/tesla/middleware/fuse.ex
	index 4128d14..af1f9fd 100644
	--- a/lib/tesla/middleware/fuse.ex
	+++ b/lib/tesla/middleware/fuse.ex
	@@ -1,61 +1,62 @@
	if Code.ensure_loaded?(:fuse) do
	defmodule Tesla.Middleware.Fuse do
	@behaviour Tesla.Middleware

	@moduledoc """
	Circuit Breaker middleware using [fuse](https://github.com/jlouis/fuse)

	Remember to add `{:fuse, "~> 2.4"}` to dependencies (and `:fuse` to applications in `mix.exs`)
	Also, you need to recompile tesla after adding `:fuse` dependency:

	```
	mix deps.clean tesla
	mix deps.compile tesla
	```

	### Example usage
	```
	defmodule MyClient do
	use Tesla

	plug Tesla.Middleware.Fuse, opts: {{:standard, 2, 10_000}, {:reset, 60_000}}
	end
	```

	### Options
	- `:name` - fuse name (defaults to module name)
	- `:opts` - fuse options (see fuse docs for reference)
	"""

	# options borrowed from http://blog.rokkincat.com/circuit-breakers-in-elixir/
	# most probably not valid for your use case
	@defaults {{:standard, 2, 10_000}, {:reset, 60_000}}

	def call(env, next, opts) do
	opts = opts \|\| []
	name = Keyword.get(opts, :name, env.__module__)

	case :fuse.ask(name, :sync) do
	:ok ->
	run(env, next, name)

	:blown ->
	{:error, :unavailable}

	{:error, :not_found} ->
	:fuse.install(name, Keyword.get(opts, :opts, @defaults))
	run(env, next, name)
	end
	end

	defp run(env, next, name) do
	case Tesla.run(env, next) do
	{:ok, env} ->
	{:ok, env}
	+
	{:error, reason} ->
	:fuse.melt(name)
	{:error, :unavailable}
	end
	end
	end
	end
	diff --git a/lib/tesla/middleware/method_override.ex b/lib/tesla/middleware/method_override.ex
	index 5f8c252..b25d8b0 100644
	--- a/lib/tesla/middleware/method_override.ex
	+++ b/lib/tesla/middleware/method_override.ex
	@@ -1,48 +1,48 @@
	defmodule Tesla.Middleware.MethodOverride do
	@behaviour Tesla.Middleware

	@moduledoc """
	Middleware that adds X-Http-Method-Override header with original request
	method and sends the request as post.

	Useful when there's an issue with sending non-post request.

	### Example
	```
	defmodule MyClient do
	use Tesla

	plug Tesla.Middleware.MethodOverride
	end
	```

	### Options
	- `:override` - list of http methods that should be overriden,
	everything except `:get` and `:post` if not specified
	"""

	def call(env, next, opts) do
	if overridable?(env, opts) do
	env
	\|> override
	\|> Tesla.run(next)
	else
	env
	\|> Tesla.run(next)
	end
	end

	defp override(env) do
	env
	\|> Tesla.put_headers([{"x-http-method-override", "#{env.method}"}])
	\|> Map.put(:method, :post)
	end

	defp overridable?(env, opts) do
	if opts[:override] do
	env.method in opts[:override]
	else
	- not env.method in [:get, :post]
	+ not (env.method in [:get, :post])
	end
	end
	end
	diff --git a/lib/tesla/middleware/retry.ex b/lib/tesla/middleware/retry.ex
	index eede27f..1f7ea0d 100644
	--- a/lib/tesla/middleware/retry.ex
	+++ b/lib/tesla/middleware/retry.ex
	@@ -1,47 +1,48 @@
	defmodule Tesla.Middleware.Retry do
	@behaviour Tesla.Middleware

	@moduledoc """
	Retry few times in case of connection refused error.

	### Example
	```
	defmodule MyClient do
	use Tesla

	plug Tesla.Middleware.Retry, delay: 500, max_retries: 10
	end
	```

	### Options
	- `:delay` - number of milliseconds to wait before retrying (defaults to 1000)
	- `:max_retries` - maximum number of retries (defaults to 5)
	"""

	@defaults [
	delay: 1000,
	max_retries: 5
	]

	def call(env, next, opts) do
	opts = opts \|\| []
	delay = Keyword.get(opts, :delay, @defaults[:delay])
	max_retries = Keyword.get(opts, :max_retries, @defaults[:max_retries])

	retry(env, next, delay, max_retries)
	end

	defp retry(env, next, _delay, retries) when retries <= 1 do
	Tesla.run(env, next)
	end

	defp retry(env, next, delay, retries) do
	case Tesla.run(env, next) do
	{:ok, env} ->
	{:ok, env}
	+
	{:error, reason} ->
	:timer.sleep(delay)
	retry(env, next, delay, retries - 1)
	end
	end
	end
	diff --git a/mix.exs b/mix.exs
	index 89edbc7..b1cecf1 100644
	--- a/mix.exs
	+++ b/mix.exs
	@@ -1,78 +1,77 @@
	defmodule Tesla.Mixfile do
	use Mix.Project

	def project do
	[
	app: :tesla,
	version: "0.10.0",
	description: description(),
	package: package(),
	source_url: "https://github.com/teamon/tesla",
	elixir: "~> 1.3",
	elixirc_paths: elixirc_paths(Mix.env()),
	deps: deps(),
	lockfile: lockfile(System.get_env("LOCKFILE")),
	test_coverage: [tool: ExCoveralls],
	dialyzer: [
	plt_add_apps: [:inets],
	plt_add_deps: :project
	],
	docs: [
	main: "readme",
	extras: ["README.md"]
	]
	]
	end

	# Configuration for the OTP application
	#
	# Type `mix help compile.app` for more information
	def application do
	[applications: applications(Mix.env())]
	end

	def applications(:test), do: applications(:dev) ++ [:httparrot, :hackney, :ibrowse]
	def applications(_), do: [:logger, :ssl, :inets]

	defp description do
	"HTTP client library, with support for middleware and multiple adapters."
	end

	defp package do
	[
	maintainers: ["Tymon Tobolski"],
	licenses: ["MIT"],
	links: %{"GitHub" => "https://github.com/teamon/tesla"}
	]
	end

	# Specifies which paths to compile per environment.
	defp elixirc_paths(:test), do: ["lib", "test/support"]
	defp elixirc_paths(_), do: ["lib"]

	defp lockfile(nil), do: "mix.lock"
	defp lockfile(lockfile), do: "test/lockfiles/#{lockfile}.lock"

	defp deps do
	[
	{:mime, "~> 1.0"},

	# http clients
	{:ibrowse, "~> 4.4.0", optional: true},
	{:hackney, "~> 1.6", optional: true},

	# json parsers
	{:poison, ">= 1.0.0", optional: true},
	-
	{:fuse, "~> 2.4", optional: true},

	# testing & docs
	{:excoveralls, "~> 0.8.0", only: :test},
	{:httparrot, "~> 1.0", only: :test},
	{:ex_doc, "~> 0.18.0", only: :dev},
	{:mix_test_watch, "~> 0.5.0", only: :dev},
	{:dialyxir, "~> 0.5.0", only: :dev},
	{:inch_ex, "~> 0.5.6", only: :docs}
	]
	end
	end
	diff --git a/test/tesla/adapter/hackney_test.exs b/test/tesla/adapter/hackney_test.exs
	index c66235b..f721d88 100644
	--- a/test/tesla/adapter/hackney_test.exs
	+++ b/test/tesla/adapter/hackney_test.exs
	@@ -1,23 +1,25 @@
	defmodule Tesla.Adapter.HackneyTest do
	use ExUnit.Case

	use Tesla.AdapterCase, adapter: Tesla.Adapter.Hackney
	use Tesla.AdapterCase.Basic
	use Tesla.AdapterCase.Multipart
	use Tesla.AdapterCase.StreamRequestBody
	- use Tesla.AdapterCase.SSL, ssl_options: [
	- cacertfile: "#{:code.priv_dir(:httparrot)}/ssl/server-ca.crt"
	- ]
	+
	+ use Tesla.AdapterCase.SSL,
	+ ssl_options: [
	+ cacertfile: "#{:code.priv_dir(:httparrot)}/ssl/server-ca.crt"
	+ ]

	alias Tesla.Env

	test "get with `with_body: true` option" do
	request = %Env{
	method: :get,
	url: "#{@http}/ip"
	}

	assert {:ok, %Env{} = response} = call(request, with_body: true)
	assert response.status == 200
	end
	end
	diff --git a/test/tesla/middleware/base_url_test.exs b/test/tesla/middleware/base_url_test.exs
	index 5a5d893..55aca8f 100644
	--- a/test/tesla/middleware/base_url_test.exs
	+++ b/test/tesla/middleware/base_url_test.exs
	@@ -1,31 +1,31 @@
	defmodule Tesla.Middleware.BaseUrlTest do
	use ExUnit.Case
	alias Tesla.Env

	@middleware Tesla.Middleware.BaseUrl

	test "base without slash, path without slash" do
	- {:ok, env} = @middleware.call(%Env{url: "path"}, [], "http://example.com")
	+ assert {:ok, env} = @middleware.call(%Env{url: "path"}, [], "http://example.com")
	assert env.url == "http://example.com/path"
	end

	test "base without slash, path with slash" do
	- {:ok, env} = @middleware.call(%Env{url: "/path"}, [], "http://example.com")
	+ assert {:ok, env} = @middleware.call(%Env{url: "/path"}, [], "http://example.com")
	assert env.url == "http://example.com/path"
	end

	test "base with slash, path without slash" do
	- {:ok, env} = @middleware.call(%Env{url: "path"}, [], "http://example.com/")
	+ assert {:ok, env} = @middleware.call(%Env{url: "path"}, [], "http://example.com/")
	assert env.url == "http://example.com/path"
	end

	test "base with slash, path with slash" do
	- {:ok, env} = @middleware.call(%Env{url: "/path"}, [], "http://example.com/")
	+ assert {:ok, env} = @middleware.call(%Env{url: "/path"}, [], "http://example.com/")
	assert env.url == "http://example.com/path"
	end

	test "skip double append" do
	- {:ok, env} = @middleware.call(%Env{url: "http://other.foo"}, [], "http://example.com")
	+ assert {:ok, env} = @middleware.call(%Env{url: "http://other.foo"}, [], "http://example.com")
	assert env.url == "http://other.foo"
	end
	end
	diff --git a/test/tesla/middleware/decode_rels_test.exs b/test/tesla/middleware/decode_rels_test.exs
	index 603a38c..6a32ff5 100644
	--- a/test/tesla/middleware/decode_rels_test.exs
	+++ b/test/tesla/middleware/decode_rels_test.exs
	@@ -1,37 +1,38 @@
	defmodule Tesla.Middleware.DecodeRelsTest do
	use ExUnit.Case

	defmodule Client do
	use Tesla

	plug Tesla.Middleware.DecodeRels

	adapter fn env ->
	- {:ok, case env.url do
	- "/rels" ->
	- Tesla.put_headers(env, [
	- {"link", ~s(<https://api.github.com/resource?page=2>; rel="next",
	+ {:ok,
	+ case env.url do
	+ "/rels" ->
	+ Tesla.put_headers(env, [
	+ {"link", ~s(<https://api.github.com/resource?page=2>; rel="next",
	<https://api.github.com/resource?page=5>; rel="last")}
	- ])
	+ ])

	- _ ->
	- env
	- end}
	+ _ ->
	+ env
	+ end}
	end
	end

	test "deocde rels" do
	assert {:ok, env} = Client.get("/rels")

	assert env.opts[:rels] == %{
	"next" => "https://api.github.com/resource?page=2",
	"last" => "https://api.github.com/resource?page=5"
	}
	end

	test "skip if no Link header" do
	assert {:ok, env} = Client.get("/")

	assert env.opts[:rels] == nil
	end
	end
	diff --git a/test/tesla/middleware/follow_redirects_test.exs b/test/tesla/middleware/follow_redirects_test.exs
	index a1974a3..378bf88 100644
	--- a/test/tesla/middleware/follow_redirects_test.exs
	+++ b/test/tesla/middleware/follow_redirects_test.exs
	@@ -1,108 +1,110 @@
	defmodule Tesla.Middleware.FollowRedirectsTest do
	use ExUnit.Case

	defmodule Client do
	use Tesla

	plug Tesla.Middleware.FollowRedirects

	adapter fn env ->
	{status, headers, body} =
	case env.url do
	"http://example.com/0" ->
	{200, [{"content-type", "text/plain"}], "foo bar"}

	"http://example.com/" <> n ->
	next = String.to_integer(n) - 1
	{301, [{"location", "http://example.com/#{next}"}], ""}
	end

	{:ok, %{env \| status: status, headers: headers, body: body}}
	end
	end

	test "redirects if default max redirects isn't exceeded" do
	- assert {:ok, env} = Client.get("http://example.com/5")
	+ assert {:ok, env} = Client.get("http://example.com/5")
	assert env.status == 200
	end

	test "raise error when redirect default max redirects is exceeded" do
	- assert {:error, {Tesla.Middleware.FollowRedirects, :too_many_redirects}} == Client.get("http://example.com/6")
	+ assert {:error, {Tesla.Middleware.FollowRedirects, :too_many_redirects}} ==
	+ Client.get("http://example.com/6")
	end

	defmodule CustomMaxRedirectsClient do
	use Tesla

	plug Tesla.Middleware.FollowRedirects, max_redirects: 1

	adapter fn env ->
	{status, headers, body} =
	case env.url do
	"http://example.com/0" ->
	{200, [{"content-type", "text/plain"}], "foo bar"}

	"http://example.com/" <> n ->
	next = String.to_integer(n) - 1
	{301, [{"location", "http://example.com/#{next}"}], ""}
	end

	{:ok, %{env \| status: status, headers: headers, body: body}}
	end
	end

	alias CustomMaxRedirectsClient, as: CMRClient

	test "redirects if custom max redirects isn't exceeded" do
	assert {:ok, env} = CMRClient.get("http://example.com/1")
	assert env.status == 200
	end

	test "raise error when custom max redirects is exceeded" do
	- assert {:error, {Tesla.Middleware.FollowRedirects, :too_many_redirects}} == CMRClient.get("http://example.com/2")
	+ assert {:error, {Tesla.Middleware.FollowRedirects, :too_many_redirects}} ==
	+ CMRClient.get("http://example.com/2")
	end

	defmodule RelativeLocationClient do
	use Tesla

	plug Tesla.Middleware.FollowRedirects

	adapter fn env ->
	{status, headers, body} =
	case env.url do
	"https://example.com/pl" ->
	{200, [{"content-type", "text/plain"}], "foo bar"}

	"http://example.com" ->
	{301, [{"location", "https://example.com"}], ""}

	"https://example.com" ->
	{301, [{"location", "/pl"}], ""}

	"https://example.com/" ->
	{301, [{"location", "/pl"}], ""}

	"https://example.com/article" ->
	{301, [{"location", "/pl"}], ""}
	end

	{:ok, %{env \| status: status, headers: headers, body: body}}
	end
	end

	alias RelativeLocationClient, as: RLClient

	test "supports relative address in location header" do
	assert {:ok, env} = RLClient.get("http://example.com")
	assert env.status == 200
	end

	test "doesn't create double slashes inside new url" do
	assert {:ok, env} = RLClient.get("https://example.com/")
	assert env.url == "https://example.com/pl"
	end

	test "rewrites URLs to their root" do
	assert {:ok, env} = RLClient.get("https://example.com/article")
	assert env.url == "https://example.com/pl"
	end
	end
	diff --git a/test/tesla/middleware/header_test.exs b/test/tesla/middleware/header_test.exs
	index a36c539..1be9efc 100644
	--- a/test/tesla/middleware/header_test.exs
	+++ b/test/tesla/middleware/header_test.exs
	@@ -1,15 +1,15 @@
	defmodule Tesla.Middleware.HeadersTest do
	use ExUnit.Case
	alias Tesla.Env

	@middleware Tesla.Middleware.Headers

	test "merge headers" do
	assert {:ok, env} =
	- @middleware.call(%Env{headers: [{"authorization", "secret"}]}, [], [
	- {"content-type", "text/plain"}
	- ])
	+ @middleware.call(%Env{headers: [{"authorization", "secret"}]}, [], [
	+ {"content-type", "text/plain"}
	+ ])

	assert env.headers == [{"authorization", "secret"}, {"content-type", "text/plain"}]
	end
	end
	diff --git a/test/tesla_test.exs b/test/tesla_test.exs
	index d59d55c..697b53b 100644
	--- a/test/tesla_test.exs
	+++ b/test/tesla_test.exs
	@@ -1,308 +1,312 @@
	defmodule TeslaTest do
	use ExUnit.Case

	require Tesla

	@url "http://localhost:#{Application.get_env(:httparrot, :http_port)}"

	describe "Adapters" do
	defmodule ModuleAdapter do
	def call(env, opts \\ []) do
	{:ok, Map.put(env, :url, env.url <> "/module/" <> opts[:with])}
	end
	end

	defmodule EmptyClient do
	use Tesla
	end

	defmodule ModuleAdapterClient do
	use Tesla

	adapter ModuleAdapter, with: "someopt"
	end

	defmodule LocalAdapterClient do
	use Tesla

	adapter :local_adapter

	def local_adapter(env) do
	{:ok, Map.put(env, :url, env.url <> "/local")}
	end
	end

	defmodule FunAdapterClient do
	use Tesla

	adapter fn env ->
	{:ok, Map.put(env, :url, env.url <> "/anon")}
	end
	end

	setup do
	# clean config
	Application.delete_env(:tesla, EmptyClient)
	Application.delete_env(:tesla, ModuleAdapterClient)
	:ok
	end

	test "defauilt adapter" do
	assert Tesla.effective_adapter(EmptyClient) == {Tesla.Adapter.Httpc, :call, [[]]}
	end

	test "use adapter override from config" do
	Application.put_env(:tesla, EmptyClient, adapter: Tesla.Mock)
	assert Tesla.effective_adapter(EmptyClient) == {Tesla.Mock, :call, [[]]}
	end

	test "prefer config over module setting" do
	Application.put_env(:tesla, ModuleAdapterClient, adapter: Tesla.Mock)
	assert Tesla.effective_adapter(ModuleAdapterClient) == {Tesla.Mock, :call, [[]]}
	end

	test "execute module adapter" do
	assert {:ok, response} = ModuleAdapterClient.request(url: "test")
	assert response.url == "test/module/someopt"
	end

	test "execute local function adapter" do
	assert {:ok, response} = LocalAdapterClient.request(url: "test")
	assert response.url == "test/local"
	end

	test "execute anonymous function adapter" do
	assert {:ok, response} = FunAdapterClient.request(url: "test")
	assert response.url == "test/anon"
	end
	end

	describe "Middleware" do
	defmodule AppendOne do
	@behaviour Tesla.Middleware

	def call(env, next, _opts) do
	env
	\|> Map.put(:url, "#{env.url}/1")
	\|> Tesla.run(next)
	end
	end

	defmodule AppendWith do
	@behaviour Tesla.Middleware

	def call(env, next, opts) do
	env
	\|> Map.update!(:url, fn url -> url <> "/MB" <> opts[:with] end)
	\|> Tesla.run(next)
	\|> case do
	{:ok, env} ->
	{:ok, Map.update!(env, :url, fn url -> url <> "/MA" <> opts[:with] end)}
	+
	error ->
	error
	end
	end
	end

	defmodule AppendClient do
	use Tesla

	plug AppendOne
	plug AppendWith, with: "1"
	plug AppendWith, with: "2"
	plug :local_middleware

	adapter fn env -> {:ok, env} end

	def local_middleware(env, next) do
	env
	\|> Map.update!(:url, fn url -> url <> "/LB" end)
	\|> Tesla.run(next)
	\|> case do
	{:ok, env} ->
	{:ok, Map.update!(env, :url, fn url -> url <> "/LA" end)}
	+
	error ->
	error
	end
	end
	end

	test "execute middleware top down" do
	assert {:ok, response} = AppendClient.get("one")
	assert response.url == "one/1/MB1/MB2/LB/LA/MA2/MA1"
	end
	end

	describe "Dynamic client" do
	defmodule DynamicClient do
	use Tesla

	adapter fn env ->
	if String.ends_with?(env.url, "/cached") do
	{:ok, %{env \| body: "cached", status: 304}}
	else
	Tesla.run_default_adapter(env)
	end
	end

	def help(client \\ %Tesla.Client{}) do
	get(client, "/help")
	end
	end

	test "override adapter - Tesla.build_client" do
	client =
	Tesla.build_client([], [
	fn env, _next ->
	{:ok, %{env \| body: "new"}}
	end
	])

	assert {:ok, %{body: "new"}} = DynamicClient.help(client)
	end

	test "override adapter - Tesla.build_adapter" do
	client =
	Tesla.build_adapter(fn env ->
	{:ok, %{env \| body: "new"}}
	end)

	assert {:ok, %{body: "new"}} = DynamicClient.help(client)
	end

	test "statically override adapter" do
	assert {:ok, %{status: 200}} = DynamicClient.get(@url <> "/ip")
	assert {:ok, %{status: 304}} = DynamicClient.get(@url <> "/cached")
	end
	end

	describe "request API" do
	defmodule SimpleClient do
	use Tesla

	adapter fn env ->
	{:ok, env}
	end
	end

	test "basic request" do
	- assert {:ok, response} = SimpleClient.request(url: "/", method: :post, query: [page: 1], body: "data")
	+ assert {:ok, response} =
	+ SimpleClient.request(url: "/", method: :post, query: [page: 1], body: "data")
	+
	assert response.method == :post
	assert response.url == "/"
	assert response.query == [page: 1]
	assert response.body == "data"
	end

	test "shortcut function" do
	assert {:ok, response} = SimpleClient.get("/get")
	assert response.method == :get
	assert response.url == "/get"
	end

	test "shortcut function with body" do
	assert {:ok, response} = SimpleClient.post("/post", "some-data")
	assert response.method == :post
	assert response.url == "/post"
	assert response.body == "some-data"
	end

	test "request with client" do
	client = fn env, next ->
	env
	\|> Map.put(:url, "/prefix" <> env.url)
	\|> Tesla.run(next)
	end

	assert {:ok, response} = SimpleClient.get("/")
	assert response.url == "/"
	assert response.__client__ == %Tesla.Client{}

	assert {:ok, response} = client \|> SimpleClient.get("/")
	assert response.url == "/prefix/"
	assert response.__client__ == %Tesla.Client{fun: client}
	end

	test "better errors when given nil opts" do
	assert_raise FunctionClauseError, fn ->
	Tesla.get("/", nil)
	end
	end
	end

	alias Tesla.Env
	import Tesla

	describe "get_header/2" do
	test "non existing header" do
	env = %Env{headers: [{"server", "Cowboy"}]}
	assert get_header(env, "some-key") == nil
	end

	test "existing header" do
	env = %Env{headers: [{"server", "Cowboy"}]}
	assert get_header(env, "server") == "Cowboy"
	end

	test "first of multiple headers with the same name" do
	env = %Env{headers: [{"cookie", "chocolate"}, {"cookie", "biscuits"}]}
	assert get_header(env, "cookie") == "chocolate"
	end
	end

	describe "get_headers/2" do
	test "none matching" do
	env = %Env{headers: [{"server", "Cowboy"}]}
	assert get_headers(env, "cookie") == []
	end

	test "multiple matches matching" do
	env = %Env{headers: [{"cookie", "chocolate"}, {"cookie", "biscuits"}]}
	assert get_headers(env, "cookie") == ["chocolate", "biscuits"]
	end
	end

	describe "put_header/3" do
	test "add new header" do
	env = %Env{}
	env = put_header(env, "server", "Cowboy")
	assert get_header(env, "server") == "Cowboy"
	end

	test "override existing header" do
	env = %Env{headers: [{"server", "Cowboy"}]}
	env = put_header(env, "server", "nginx")
	assert get_header(env, "server") == "nginx"
	end
	end

	describe "put_headers/2" do
	test "add headers to env existing header" do
	env = %Env{}
	assert get_header(env, "server") == nil

	env = Tesla.put_headers(env, [{"server", "Cowboy"}, {"content-length", "100"}])
	assert get_header(env, "server") == "Cowboy"
	assert get_header(env, "content-length") == "100"

	env = Tesla.put_headers(env, [{"server", "nginx"}, {"content-type", "text/plain"}])
	assert get_header(env, "server") == "Cowboy"
	assert get_header(env, "content-length") == "100"
	assert get_header(env, "content-type") == "text/plain"
	end

	test "add multiple headers with the same name" do
	env = %Env{}
	env = Tesla.put_headers(env, [{"cookie", "chocolate"}, {"cookie", "biscuits"}])
	assert get_headers(env, "cookie") == ["chocolate", "biscuits"]
	end
	end

	describe "delete_header/2" do
	test "delete all headers with given name" do
	env = %Env{headers: [{"cookie", "chocolate"}, {"server", "Cowboy"}, {"cookie", "biscuits"}]}
	env = delete_header(env, "cookie")
	assert get_header(env, "cookie") == nil
	assert get_header(env, "server") == "Cowboy"
	end
	end
	end

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