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	diff --git a/lib/tesla.ex b/lib/tesla.ex
	index 7980d36..35ebee7 100644
	--- a/lib/tesla.ex
	+++ b/lib/tesla.ex
	@@ -1,215 +1,233 @@
	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 __module__ :: atom
	@type __client__ :: function

	@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__: __module__,
	__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) :: Tesla.Env.t()
	end

	defmodule Tesla.Adapter do
	@callback call(env :: Tesla.Env.t(), options :: any) :: Tesla.Env.t()
	end

	defmodule Tesla do
	use Tesla.Builder

	+ @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

	- def perform_request(module, client \\ nil, options) do
	- %{fun: fun, pre: pre, post: post} = client \|\| %Tesla.Client{}
	-
	- stack = pre ++ wrapfun(fun) ++ module.__middleware__ ++ post ++ [module.__adapter__]
	-
	+ @doc false
	+ def execute(module, %{fun: fun, pre: pre, post: post} = client, options) do
	env = struct(Tesla.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: 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(Tesla.Env.t, binary) :: binary \| nil
	def get_header(%Tesla.Env{headers: headers}, key) when is_list(headers) do
	case List.keyfind(headers, key, 0) do
	{_, value} -> value
	_ -> nil
	end
	end

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

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

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

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

	- def adapter(module, custom) do
	- cond do
	- mod = module_adapter_from_config(module) -> {mod, :call, [[]]}
	- custom -> custom
	- true -> {default_adapter(), :call, [[]]}
	- end
	- end
	-
	- defp module_adapter_from_config(module) do
	- Application.get_env(:tesla, module, [])[:adapter]
	- end
	-
	- def default_adapter do
	- Application.get_env(:tesla, :adapter, Tesla.Adapter.Httpc)
	- end
	-
	- def run_default_adapter(env, opts \\ []) do
	- apply(default_adapter(), :call, [env, opts])
	- end
	-
	@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/builder.ex b/lib/tesla/builder.ex
	index 9de8b7f..9ed7c7b 100644
	--- a/lib/tesla/builder.ex
	+++ b/lib/tesla/builder.ex
	@@ -1,331 +1,331 @@
	defmodule Tesla.Builder do
	@http_verbs ~w(head get delete trace options post put patch)a

	defmacro __using__(opts \\ []) do
	opts = Macro.prewalk(opts, &Macro.expand(&1, __CALLER__))
	docs = Keyword.get(opts, :docs, true)

	quote do
	Module.register_attribute(__MODULE__, :__middleware__, accumulate: true)
	Module.register_attribute(__MODULE__, :__adapter__, [])

	if unquote(docs) do
	@type option ::
	{:method, Tesla.Env.method()}
	\| {:url, Tesla.Env.url()}
	\| {:query, Tesla.Env.query()}
	\| {:headers, Tesla.Env.headers()}
	\| {:body, Tesla.Env.body()}
	\| {:opts, Tesla.Env.opts()}

	@doc """
	Perform a request using client function

	Options:
	- `:method` - the request method, one of [:head, :get, :delete, :trace, :options, :post, :put, :patch]
	- `:url` - either full url e.g. "http://example.com/some/path" or just "/some/path" if using `Tesla.Middleware.BaseUrl`
	- `:query` - a keyword list of query params, e.g. `[page: 1, per_page: 100]`
	- `:headers` - a keyworld list of headers, e.g. `[{"content-type", "text/plain"}]`
	- `:body` - depends on used middleware:
	- by default it can be a binary
	- if using e.g. JSON encoding middleware it can be a nested map
	- if adapter supports it it can be a Stream with any of the above
	- `:opts` - custom, per-request middleware or adapter options

	Examples:

	ExampleApi.request(method: :get, url: "/users/path")

	You can also use shortcut methods like:

	ExampleApi.get("/users/1")

	or

	myclient \|> ExampleApi.post("/users", %{name: "Jon"})
	"""
	@spec request(Tesla.Env.client(), [option]) :: Tesla.Env.t()
	else
	@doc false
	end

	def request(%Tesla.Client{} = client, options) do
	- Tesla.perform_request(__MODULE__, client, options)
	+ Tesla.execute(__MODULE__, client, options)
	end

	if unquote(docs) do
	@doc """
	Perform a request. See `request/2` for available options.
	"""
	@spec request([option]) :: Tesla.Env.t()
	else
	@doc false
	end

	def request(options) do
	- Tesla.perform_request(__MODULE__, options)
	+ Tesla.execute(__MODULE__, %Tesla.Client{}, options)
	end

	unquote(generate_http_verbs(opts))

	import Tesla.Builder, only: [plug: 1, plug: 2, adapter: 1, adapter: 2]
	@before_compile Tesla.Builder
	end
	end

	@doc """
	Attach middleware to your API client

	```ex
	defmodule ExampleApi do
	use Tesla

	# plug middleware module with options
	plug Tesla.Middleware.BaseUrl, "http://api.example.com"
	plug Tesla.Middleware.JSON, engine: Poison

	# plug middleware function
	plug :handle_errors

	# middleware function gets two parameters: Tesla.Env and the rest of middleware call stack
	# and must return Tesla.Env
	def handle_errors(env, next) do
	env
	\|> modify_env_before_request
	\|> Tesla.run(next) # run the rest of stack
	\|> modify_env_after_request
	end
	end
	"""
	defmacro plug(middleware, opts \\ nil) do
	quote do: @__middleware__ {unquote(Macro.escape(middleware)), unquote(Macro.escape(opts))}
	end

	@doc """
	Choose adapter for your API client

	```ex
	defmodule ExampleApi do
	use Tesla

	# set adapter as module
	adapter Tesla.Adapter.Hackney

	# set adapter as function
	adapter :local_adapter

	# set adapter as anonymous function
	adapter fn env ->
	...
	env
	end


	# adapter function gets Tesla.Env as parameter and must return Tesla.Env
	def local_adapter(env) do
	...
	env
	end
	end
	"""
	defmacro adapter(adapter, opts \\ nil) do
	quote do: @__adapter__ {unquote(Macro.escape(adapter)), unquote(Macro.escape(opts))}
	end

	defp generate_http_verbs(opts) do
	only = Keyword.get(opts, :only, @http_verbs)
	except = Keyword.get(opts, :except, [])

	@http_verbs
	\|> Enum.filter(&(&1 in only && not &1 in except))
	\|> Enum.map(&generate_api(&1, Keyword.get(opts, :docs, true)))
	end

	defp generate_api(method, docs) when method in [:post, :put, :patch] do
	quote do
	if unquote(docs) do
	@doc """
	Perform a #{unquote(method \|> to_string \|> String.upcase())} request.
	See `request/1` or `request/2` for options definition.

	Example
	myclient \|> ExampleApi.#{unquote(method)}("/users", %{name: "Jon"}, query: [scope: "admin"])
	"""
	@spec unquote(method)(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body(), [option]) ::
	Tesla.Env.t()
	else
	@doc false
	end

	def unquote(method)(%Tesla.Client{} = client, url, body, options) when is_list(options) do
	request(client, [method: unquote(method), url: url, body: body] ++ options)
	end

	# fallback to keep backward compatibility
	def unquote(method)(fun, url, body, options) when is_function(fun) and is_list(options) do
	unquote(method)(%Tesla.Client{fun: fun}, url, body, options)
	end

	if unquote(docs) do
	@doc """
	Perform a #{unquote(method \|> to_string \|> String.upcase())} request.
	See `request/1` or `request/2` for options definition.

	Example
	myclient \|> ExampleApi.#{unquote(method)}("/users", %{name: "Jon"})
	ExampleApi.#{unquote(method)}("/users", %{name: "Jon"}, query: [scope: "admin"])
	"""
	@spec unquote(method)(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body()) ::
	Tesla.Env.t()
	else
	@doc false
	end

	def unquote(method)(%Tesla.Client{} = client, url, body) do
	request(client, method: unquote(method), url: url, body: body)
	end

	# fallback to keep backward compatibility
	def unquote(method)(fun, url, body) when is_function(fun) do
	unquote(method)(%Tesla.Client{fun: fun}, url, body)
	end

	if unquote(docs) do
	@spec unquote(method)(Tesla.Env.url(), Tesla.Env.body(), [option]) :: Tesla.Env.t()
	else
	@doc false
	end

	def unquote(method)(url, body, options) when is_list(options) do
	request([method: unquote(method), url: url, body: body] ++ options)
	end

	if unquote(docs) do
	@doc """
	Perform a #{unquote(method \|> to_string \|> String.upcase())} request.
	See `request/1` or `request/2` for options definition.

	Example
	ExampleApi.#{unquote(method)}("/users", %{name: "Jon"})
	"""
	@spec unquote(method)(Tesla.Env.url(), Tesla.Env.body()) :: Tesla.Env.t()
	else
	@doc false
	end

	def unquote(method)(url, body) do
	request(method: unquote(method), url: url, body: body)
	end
	end
	end

	defp generate_api(method, docs) when method in [:head, :get, :delete, :trace, :options] do
	quote do
	if unquote(docs) do
	@doc """
	Perform a #{unquote(method \|> to_string \|> String.upcase())} request.
	See `request/1` or `request/2` for options definition.

	Example
	myclient \|> ExampleApi.#{unquote(method)}("/users", query: [page: 1])
	"""
	@spec unquote(method)(Tesla.Env.client(), Tesla.Env.url(), [option]) :: Tesla.Env.t()
	else
	@doc false
	end

	def unquote(method)(%Tesla.Client{} = client, url, options) when is_list(options) do
	request(client, [method: unquote(method), url: url] ++ options)
	end

	# fallback to keep backward compatibility
	def unquote(method)(fun, url, options) when is_function(fun) and is_list(options) do
	unquote(method)(%Tesla.Client{fun: fun}, url, options)
	end

	if unquote(docs) do
	@doc """
	Perform a #{unquote(method \|> to_string \|> String.upcase())} request.
	See `request/1` or `request/2` for options definition.

	Example
	myclient \|> ExampleApi.#{unquote(method)}("/users")
	ExampleApi.#{unquote(method)}("/users", query: [page: 1])
	"""
	@spec unquote(method)(Tesla.Env.client(), Tesla.Env.url()) :: Tesla.Env.t()
	else
	@doc false
	end

	def unquote(method)(%Tesla.Client{} = client, url) do
	request(client, method: unquote(method), url: url)
	end

	# fallback to keep backward compatibility
	def unquote(method)(fun, url) when is_function(fun) do
	unquote(method)(%Tesla.Client{fun: fun}, url)
	end

	if unquote(docs) do
	@spec unquote(method)(Tesla.Env.url(), [option]) :: Tesla.Env.t()
	else
	@doc false
	end

	def unquote(method)(url, options) when is_list(options) do
	request([method: unquote(method), url: url] ++ options)
	end

	if unquote(docs) do
	@doc """
	Perform a #{unquote(method \|> to_string \|> String.upcase())} request.
	See `request/1` or `request/2` for options definition.

	Example
	ExampleApi.#{unquote(method)}("/users")
	"""
	@spec unquote(method)(Tesla.Env.url()) :: Tesla.Env.t()
	else
	@doc false
	end

	def unquote(method)(url) do
	request(method: unquote(method), url: url)
	end
	end
	end

	defmacro __before_compile__(env) do
	adapter =
	env.module
	\|> Module.get_attribute(:__adapter__)
	\|> prepare()

	middleware =
	env.module
	\|> Module.get_attribute(:__middleware__)
	\|> Enum.reverse()
	\|> prepare()

	quote do
	def __middleware__, do: unquote(middleware)
	- def __adapter__, do: Tesla.adapter(__MODULE__, unquote(adapter))
	+ def __adapter__, do: unquote(adapter)
	end
	end

	defmacro client(pre, post) do
	quote do
	%Tesla.Client{
	pre: unquote(prepare(pre)),
	post: unquote(prepare(post))
	}
	end
	end

	defp prepare(list) when is_list(list), do: Enum.map(list, &prepare/1)
	defp prepare(nil), do: nil
	defp prepare({{:fn, _, _} = fun, nil}), do: {:fn, fun}
	defp prepare({{:__aliases__, _, _} = name, opts}), do: quote do: {unquote(name), :call, [unquote(opts)]}
	defp prepare({name, nil}) when is_atom(name), do: quote do: {__MODULE__, unquote(name), []}
	defp prepare(name), do: prepare({name, nil})
	end
	diff --git a/test/tesla/builder_test.exs b/test/tesla/builder_test.exs
	index 2383c9d..2f6f15c 100644
	--- a/test/tesla/builder_test.exs
	+++ b/test/tesla/builder_test.exs
	@@ -1,105 +1,105 @@
	defmodule Tesla.BuilderTest do
	use ExUnit.Case

	alias Tesla.Builder

	describe "Compilation" do
	defmodule TestClientPlug do
	use Tesla.Builder

	@attr "value"

	plug FirstMiddleware, @attr
	plug SecondMiddleware, options: :are, fun: 1
	plug ThirdMiddleware
	plug :local_middleware
	plug fn env, _next -> env end
	end

	defmodule TestClientModule do
	use Tesla.Builder
	adapter TheAdapter, hello: "world"
	end

	defmodule TestClientFunction do
	use Tesla.Builder
	adapter :local_adapter
	end

	defmodule TestClientAnon do
	use Tesla.Builder
	adapter fn env -> env end
	end


	test "generate __middleware__/0" do
	assert [
	{FirstMiddleware, :call, ["value"]},
	{SecondMiddleware, :call, [[options: :are, fun: 1]]},
	{ThirdMiddleware, :call, [nil]},
	{TestClientPlug, :local_middleware, []},
	{:fn, fun}
	] = TestClientPlug.__middleware__
	assert is_function(fun)
	end

	- # test "generate __adapter__/0 - adapter not set" do
	- # assert TestClientPlug.__adapter__ == nil
	- # end
	+ test "generate __adapter__/0 - adapter not set" do
	+ assert TestClientPlug.__adapter__ == nil
	+ end

	test "generate __adapter__/0 - adapter as module" do
	assert TestClientModule.__adapter__ == {TheAdapter, :call, [[hello: "world"]]}
	end

	test "generate __adapter__/0 - adapter as module function" do
	assert TestClientFunction.__adapter__ == {TestClientFunction, :local_adapter, []}
	end

	test "generate __adapter__/0 - adapter as anonymous function" do
	assert {:fn, fun} = TestClientAnon.__adapter__
	assert is_function(fun)
	end
	end

	describe ":only/:except options" do
	defmodule OnlyGetClient do
	use Builder, only: [:get]
	end

	defmodule ExceptDeleteClient do
	use Builder, except: ~w(delete)a
	end

	@http_verbs ~w(head get delete trace options post put patch)a

	test "limit generated functions (only)" do
	functions = OnlyGetClient.__info__(:functions) \|> Keyword.keys() \|> Enum.uniq()
	assert :get in functions
	refute Enum.any?(@http_verbs -- [:get], &(&1 in functions))
	end

	test "limit generated functions (except)" do
	functions = ExceptDeleteClient.__info__(:functions) \|> Keyword.keys() \|> Enum.uniq()
	refute :delete in functions
	assert Enum.all?(@http_verbs -- [:delete], &(&1 in functions))
	end
	end

	describe ":docs option" do
	# Code.get_docs/2 requires .beam file of given module to exist in file system
	# See test/support/docs.ex file for definitions of TeslaDocsTest.* modules

	test "generate docs by default" do
	docs = Code.get_docs(TeslaDocsTest.Default, :docs)
	assert {_, _, _, _, doc} = Enum.find(docs, &match?({{:get, 1}, _, :def, _, _}, &1))
	assert doc != false
	end

	test "do not generate docs for HTTP methods when docs: false" do
	docs = Code.get_docs(TeslaDocsTest.NoDocs, :docs)
	assert {_, _, _, _, false} = Enum.find(docs, &match?({{:get, 1}, _, :def, _, _}, &1))
	assert {_, _, _, _, doc} = Enum.find(docs, &match?({{:custom, 1}, _, :def, _, _}, &1))
	assert doc =~ ~r/something/
	end
	end
	end
	diff --git a/test/tesla_test.exs b/test/tesla_test.exs
	index a1d754e..0f0dff1 100644
	--- a/test/tesla_test.exs
	+++ b/test/tesla_test.exs
	@@ -1,298 +1,298 @@
	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
	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
	Map.put(env, :url, env.url <> "/local")
	end
	end

	defmodule FunAdapterClient do
	use Tesla

	adapter fn env ->
	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 EmptyClient.__adapter__() == {Tesla.Adapter.Httpc, :call, [[]]}
	+ assert Tesla.effective_adapter(EmptyClient) == {Tesla.Adapter.Httpc, :call, [[]]}
	end

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

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

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

	test "use adapter override from config" do
	Application.put_env(:tesla, EmptyClient, adapter: Tesla.Mock)
	- assert EmptyClient.__adapter__() == {Tesla.Mock, :call, [[]]}
	+ 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 ModuleAdapterClient.__adapter__() == {Tesla.Mock, :call, [[]]}
	+ assert Tesla.effective_adapter(ModuleAdapterClient) == {Tesla.Mock, :call, [[]]}
	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)
	\|> Map.update!(:url, fn url -> url <> "/MA" <> opts[:with] end)
	end
	end

	defmodule AppendClient do
	use Tesla

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

	adapter fn env -> env end

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

	test "execute middleware top down" do
	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
	%{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 ->
	%{env \| body: "new"}
	end
	])

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

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

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

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

	describe "request API" do
	defmodule SimpleClient do
	use Tesla

	adapter fn env ->
	env
	end
	end

	test "basic request" do
	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
	response = SimpleClient.get("/get")
	assert response.method == :get
	assert response.url == "/get"
	end

	test "shortcut function with body" do
	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

	response = SimpleClient.get("/")
	assert response.url == "/"
	refute response.__client__

	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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