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	diff --git a/lib/tesla.ex b/lib/tesla.ex
	index d5ce859..f3c4e65 100644
	--- a/lib/tesla.ex
	+++ b/lib/tesla.ex
	@@ -1,512 +1,512 @@
	defmodule Tesla.Error do
	defexception env: nil, stack: [], reason: nil

	def message(%Tesla.Error{env: %{url: url, method: method}, reason: reason}) do
	"#{inspect(reason)} (#{method \|> to_string \|> String.upcase()} #{url})"
	end
	end

	defmodule Tesla.Env do
	@moduledoc """
	This module defines a `t:Tesla.Env.t/0` struct that stores all data related to request/response.

	## Fields

	* `:method` - method of request. Example: `:get`
	* `:url` - request url. Example: `"https://www.google.com"`
	* `:query` - list of query params.
	Example: `[{"param", "value"}]` will be translated to `?params=value`.
	Note: query params passed in url (e.g. `"/get?param=value"`) are not parsed to `query` field.
	* `:headers` - list of request/response headers.
	Example: `[{"content-type", "application/json"}]`.
	Note: request headers are overriden by response headers when adapter is called.
	* `:body` - request/response body.
	Note: request body is overriden by response body when adapter is called.
	* `:status` - response status. Example: `200`
	* `:opts` - list of options. Example: `[adapter: [recv_timeout: 30_000]]`
	"""

	@type client :: Tesla.Client.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 result :: {:ok, t()} \| {:error, any}

	@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 adapter :: atom \| {atom, Tesla.Env.opts()}
	- @type middleware :: atom \| {atom, Tesla.Env.opts()}
	+ @type adapter :: module \| {atom, Tesla.Env.opts()}
	+ @type middleware :: module \| {atom, Tesla.Env.opts()}

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

	defmodule Tesla.Middleware do
	@moduledoc """
	The middleware specification

	Middleware is an extension of basic `Tesla` functionality. It is a module that must
	export `call/3` function.

	## Middleware options

	Options can be passed to middleware in second param of `Tesla.Builder.plug/2` macro:

	plug Tesla.Middleware.BaseUrl, "https://example.com"

	or inside tuple in case of dynamic middleware (`Tesla.client/1`)

	Tesla.client([{Tesla.Middleware.BaseUrl, "https://example.com"}])

	## Writing custom middleware

	Writing custom middleware is as simple as creating a module with `call/3` function that:
	* (optionally) read and/or writes request data
	* calls `Tesla.run/2`
	* (optionally) read and/or writes response data

	`call/3` params:
	* env - `Tesla.Env` struct that stores request/response data
	* stack - middlewares that should be called after current one
	* options - middleware options provided by user

	#### Example

	defmodule MyProject.InspectHeadersMiddleware do
	@behaviour Tesla.Middleware

	@impl true
	def call(env, next, options) do
	env
	\|> inspect_headers(options)
	\|> Tesla.run(next)
	\|> inspect_headers(options)
	end

	defp inspect_headers(env, options) do
	IO.inspect(env.headers, options)
	end
	end

	"""
	@callback call(env :: Tesla.Env.t(), next :: Tesla.Env.stack(), options :: any) ::
	Tesla.Env.result()
	end

	defmodule Tesla.Adapter do
	@moduledoc """
	The adapter specification

	Adapter is a module that denormalize request data stored in `Tesla.Env` in order to make
	request with lower level http client (e.g. `:httpc` or `:hackney`) and normalize response data
	in order to store it back to `Tesla.Env`. It has to export `call/2` function.

	## Writing custom adapter

	`call/2` params:
	* env - `Tesla.Env` struct that stores request/response data
	* options - middleware options provided by user

	#### Example

	defmodule MyProject.CustomAdapter do
	alias Tesla.Multipart

	@behaviour Tesla.Adapter

	@override_defaults [follow_redirect: false]

	@impl true
	def call(env, opts) do
	opts = Tesla.Adapter.opts(@override_defaults, env, opts)

	with {:ok, {status, headers, body}} <- request(env.method, env.body, env.headers, opts) do
	{:ok, normalize_response(env, status, headers, body)}
	end
	end

	defp request(_method, %Stream{}, _headers, _opts) do
	{:error, "stream not supported by adapter"}
	end

	defp request(_method, %Multipart{}, _headers, _opts) do
	{:error, "multipart not supported by adapter"}
	end

	defp request(method, body, headers, opts) do
	:lower_level_http.request(method, body, denormalize_headers(headers), opts)
	end

	defp denormalize_headers(headers), do: ...
	defp normalize_response(env, status, headers, body), do: %Tesla.Env{env \| ...}
	end

	"""
	@callback call(env :: Tesla.Env.t(), options :: any) :: Tesla.Env.result()

	@doc """
	Helper function that merges all adapter options

	## Params:
	* `defaults` (optional) - useful to override lower level http client default configuration
	* `env` - `Tesla.Env` struct
	* `opts` - options provided to `Tesla.Builder.adapter/2` macro

	## Precedence rules:
	* config from `opts` overrides config from `defaults` when same key is encountered
	* config from `env` overrides config from both `defaults` and `opts` when same key is encountered
	"""
	@spec opts(Keyword.t(), Tesla.Env.t(), Keyword.t()) :: Keyword.t()
	def opts(defaults \\ [], env, opts) do
	defaults
	\|> Keyword.merge(opts \|\| [])
	\|> Keyword.merge(env.opts[:adapter] \|\| [])
	end
	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

	## Building API client

	`use Tesla` macro will generate basic http functions (e.g. get, post) inside your module.
	It supports following options:
	* `:only` - builder will generate only functions included in list given in this option
	* `:except` - builder won't generate functions included in list given in this option
	* `:docs` - when set to false builder will won't add documentation to generated functions

	#### Example

	defmodule ExampleApi do
	use Tesla, only: [:get], docs: false

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

	def fetch_data do
	get("/data")
	end
	end

	In example above `ExampleApi.fetch_data/0` is equivalent of `ExampleApi.get("/data")`

	## Direct usage

	It is also possible to do request directly with `Tesla` module.

	Tesla.get("https://example.com")

	#### Common pitfalls

	Direct usage won't include any middlewares.

	In following example:

	defmodule ExampleApi do
	use Tesla, only: [:get], docs: false

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

	def fetch_data do
	Tesla.get("/data")
	end
	end

	call to `ExampleApi.fetch_data/0` will fail, because request will be missing base url.

	## Default adapter

	By default `Tesla` is using `Tesla.Adapter.Httpc`, because `:httpc` is included in Erlang/OTP and
	doen not require installation of any additional dependency. It can be changed globally with config

	config :tesla, :adapter, Tesla.Adapter.Hackney

	or by `Tesla.Builder.adapter/2` macro for given API client module

	defmodule ExampleApi do
	use Tesla

	adapter Tesla.Adapter.Hackney

	...
	end

	"""

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

	@doc false
	def execute(module, client, options) do
	{env, stack} = prepare(module, client, options)
	run(env, stack)
	end

	@doc false
	def execute!(module, client, options) do
	{env, stack} = prepare(module, client, options)

	case run(env, stack) do
	{:ok, env} -> env
	{:error, error} -> raise Tesla.Error, env: env, stack: stack, reason: error
	end
	end

	defp prepare(module, %{pre: pre, post: post} = client, options) do
	env = struct(Env, options ++ [__module__: module, __client__: client])
	stack = pre ++ module.__middleware__ ++ post ++ [effective_adapter(module, client)]
	{env, stack}
	end

	@doc false
	def effective_adapter(module, client \\ %Tesla.Client{}) do
	with nil <- client.adapter,
	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])

	@doc """
	Adds given key/value pair to `:opts` field in `Tesla.Env`

	Useful when there's need to store additional middleware data in `Tesla.Env`

	## Example

	iex> %Tesla.Env{opts: []} \|> Tesla.put_opt(:option, "value")
	%Tesla.Env{opts: [option: "value"]}

	"""
	@spec put_opt(Tesla.Env.t(), atom, any) :: Tesla.Env.t()
	def put_opt(env, key, value) do
	Map.update!(env, :opts, &Keyword.put(&1, key, value))
	end

	@doc """
	Returns value of header specified by `key` from `:headers` field in `Tesla.Env`

	## Examples

	# non existing header
	iex> env = %Tesla.Env{headers: [{"server", "Cowboy"}]}
	iex> Tesla.get_header(env, "some-key")
	nil

	# existing header
	iex> env = %Tesla.Env{headers: [{"server", "Cowboy"}]}
	iex> Tesla.get_header(env, "server")
	"Cowboy"

	# first of multiple headers with the same name
	iex> env = %Tesla.Env{headers: [{"cookie", "chocolate"}, {"cookie", "biscuits"}]}
	iex> Tesla.get_header(env, "cookie")
	"chocolate"

	"""
	@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 and/or adapter.

	```
	# add dynamic middleware
	client = Tesla.client([{Tesla.Middleware.Headers, [{"authorization", token}]}])
	Tesla.get(client, "/path")

	# configure adapter in runtime
	client = Tesla.client([], Tesla.Adapter.Hackney)
	client = Tesla.client([], {Tesla.Adapter.Hackney, pool: :my_pool)
	Tesla.get(client, "/path")

	# complete module example
	defmodule MyApi do
	# note there is no need for `use Tesla`

	@middleware [
	{Tesla.Middleware.BaseUrl, "https://example.com"},
	Tesla.Middleware.JSON,
	Tesla.Middleware.Logger
	]

	@adapter Tesla.Adapter.Hackney

	def new(opts) do
	# do any middleware manipulation you need
	middleware = [
	{Tesla.Middleware.BasicAuth, username: opts[:username], password: opts[:password]}
	] ++ @middleware

	# allow configuring adapter in runtime
	adapter = opts[:adapter] \|\| @adapter

	# use Tesla.client/2 to put it all together
	Tesla.client(middleware, adapter)
	end

	def get_something(client, id) do
	# pass client directly to Tesla.get/2
	Tesla.get(client, "/something/\#{id}")
	# ...
	end
	end

	client = MyApi.new(username: "admin", password: "secret")
	MyApi.get_something(client, 42)
	```
	"""
	@since "1.2.0"
	@spec client([Tesla.Client.middleware()], Tesla.Client.adapter()) :: Tesla.Client.t()
	def client(middleware, adapter \\ nil), do: Tesla.Builder.client(middleware, [], adapter)

	@deprecated "Use client/1 or client/2 instead"
	def build_client(pre, post \\ []), do: Tesla.Builder.client(pre, post)

	@deprecated "Use client/1 or client/2 instead"
	def build_adapter(fun), do: Tesla.Builder.client([], [], fun)

	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

	@doc false
	def 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

	@doc false
	def encode_pair({key, value}), do: [{key, value}]
	end
	diff --git a/lib/tesla/builder.ex b/lib/tesla/builder.ex
	index 2da13dc..8a658e4 100644
	--- a/lib/tesla/builder.ex
	+++ b/lib/tesla/builder.ex
	@@ -1,335 +1,340 @@
	defmodule Tesla.Builder do
	@http_verbs ~w(head get delete trace options post put patch)a
	@body ~w(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__, [])

	@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()}

	if unquote(docs) do
	@doc """
	Perform a request

	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

	ExampleApi.post(client, "/users", %{name: "Jon"})
	"""
	else
	@doc false
	end

	@spec request(Tesla.Env.client(), [option]) :: Tesla.Env.result()
	def request(%Tesla.Client{} = client \\ %Tesla.Client{}, options) do
	Tesla.execute(__MODULE__, client, options)
	end

	if unquote(docs) do
	@doc """
	Perform request and raise in case of error.

	This is similar to `request/2` behaviour from Tesla 0.x

	See `request/2` for list of available options.
	"""
	else
	@doc false
	end

	@spec request!(Tesla.Env.client(), [option]) :: Tesla.Env.t() \| no_return
	def request!(%Tesla.Client{} = client \\ %Tesla.Client{}, options) do
	Tesla.execute!(__MODULE__, 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

	```
	defmodule ExampleApi do
	use Tesla

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

	# or without options
	plug Tesla.Middleware.JSON

	# or a custom middleware
	plug MyProject.CustomMiddleware
	end
	"""

	defmacro plug(middleware, opts) do
	quote do
	@__middleware__ {
	{unquote(Macro.escape(middleware)), unquote(Macro.escape(opts))},
	{:middleware, unquote(Macro.escape(__CALLER__))}
	}
	end
	end

	defmacro plug(middleware) do
	quote do
	@__middleware__ {
	unquote(Macro.escape(middleware)),
	{:middleware, unquote(Macro.escape(__CALLER__))}
	}
	end
	end

	@doc """
	Choose adapter for your API client

	```
	defmodule ExampleApi do
	use Tesla

	# set adapter as module
	adapter Tesla.Adapter.Hackney

	# set adapter as anonymous function
	adapter fn env ->
	...
	env
	end
	end
	"""
	defmacro adapter(name, opts) do
	quote do
	@__adapter__ {
	{unquote(Macro.escape(name)), unquote(Macro.escape(opts))},
	{:adapter, unquote(Macro.escape(__CALLER__))}
	}
	end
	end

	defmacro adapter(name) do
	quote do
	@__adapter__ {
	unquote(Macro.escape(name)),
	{:adapter, unquote(Macro.escape(__CALLER__))}
	}
	end
	end

	defmacro __before_compile__(env) do
	Tesla.Migration.breaking_alias_in_config!(env.module)

	adapter =
	env.module
	\|> Module.get_attribute(:__adapter__)
	\|> compile()

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

	quote location: :keep do
	def __middleware__, do: unquote(middleware)
	def __adapter__, do: unquote(adapter)
	end
	end

	- def client(pre, post, adapter \\ nil) do
	+ def client(pre, post, adapter \\ nil)
	+
	+ def client(pre, post, nil) do
	+ %Tesla.Client{pre: runtime(pre), post: runtime(post)}
	+ end
	+
	+ def client(pre, post, adapter) do
	%Tesla.Client{pre: runtime(pre), post: runtime(post), adapter: runtime(adapter)}
	end

	@default_opts []

	defp compile(nil), do: nil
	defp compile(list) when is_list(list), do: Enum.map(list, &compile/1)

	# {Tesla.Middleware.Something, opts}
	defp compile({{{:__aliases__, _, _} = ast_mod, ast_opts}, {_kind, caller}}) do
	Tesla.Migration.breaking_headers_map!(ast_mod, ast_opts, caller)
	quote do: {unquote(ast_mod), :call, [unquote(ast_opts)]}
	end

	# :local_middleware, opts
	defp compile({{name, _opts}, {kind, caller}}) when is_atom(name) do
	Tesla.Migration.breaking_alias!(kind, name, caller)
	end

	# Tesla.Middleware.Something
	defp compile({{:__aliases__, _, _} = ast_mod, {_kind, _caller}}) do
	quote do: {unquote(ast_mod), :call, [unquote(@default_opts)]}
	end

	# fn env -> ... end
	defp compile({{:fn, _, _} = ast_fun, {_kind, _caller}}) do
	quote do: {:fn, unquote(ast_fun)}
	end

	# :local_middleware
	defp compile({name, {kind, caller}}) when is_atom(name) do
	Tesla.Migration.breaking_alias!(kind, name, caller)
	end

	- defp runtime(nil), do: nil
	defp runtime(list) when is_list(list), do: Enum.map(list, &runtime/1)
	defp runtime({module, opts}) when is_atom(module), do: {module, :call, [opts]}
	defp runtime(fun) when is_function(fun), do: {:fn, fun}
	defp runtime(module) when is_atom(module), do: {module, :call, [@default_opts]}

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

	for method <- @http_verbs do
	for bang <- [:safe, :bang],
	client <- [:client, :noclient],
	opts <- [:opts, :noopts],
	method in only && not (method in except) do
	gen(method, bang, client, opts, docs)
	end
	end
	end

	defp gen(method, safe, client, opts, docs) do
	quote location: :keep do
	unquote(gen_doc(method, safe, client, opts, docs))
	unquote(gen_spec(method, safe, client, opts))
	unquote(gen_fun(method, safe, client, opts))
	unquote(gen_deprecated(method, safe, client, opts))
	end
	end

	defp gen_doc(method, safe, :client, :opts, true) do
	request = to_string(req(safe))
	name = name(method, safe)
	body = if method in @body, do: ~s\|, %{name: "Jon"}\|, else: ""

	quote location: :keep do
	@doc """
	Perform a #{unquote(method \|> to_string \|> String.upcase())} request.

	See `#{unquote(request)}/1` or `#{unquote(request)}/2` for options definition.

	#{unquote(name)}("/users"#{unquote(body)})
	#{unquote(name)}("/users"#{unquote(body)}, query: [scope: "admin"])
	#{unquote(name)}(client, "/users"#{unquote(body)})
	#{unquote(name)}(client, "/users"#{unquote(body)}, query: [scope: "admin"])
	"""
	end
	end

	defp gen_doc(_method, _bang, _client, _opts, _) do
	quote location: :keep do
	@doc false
	end
	end

	defp gen_spec(method, safe, client, opts) do
	quote location: :keep do
	@spec unquote(name(method, safe))(unquote_splicing(types(method, client, opts))) ::
	unquote(type(safe))
	end
	end

	defp gen_fun(method, safe, client, opts) do
	quote location: :keep do
	def unquote(name(method, safe))(unquote_splicing(inputs(method, client, opts))) do
	unquote(req(safe))(unquote_splicing(outputs(method, client, opts)))
	end
	end
	\|> gen_guards(opts)
	end

	defp gen_guards({:def, _, [head, [do: body]]}, :opts) do
	quote do
	def unquote(head) when is_list(opts), do: unquote(body)
	end
	end

	defp gen_guards(def, _opts), do: def

	defp gen_deprecated(method, safe, :client, opts) do
	inputs = [quote(do: client) \| inputs(method, :noclient, opts)]

	quote location: :keep do
	def unquote(name(method, safe))(unquote_splicing(inputs)) when is_function(client) do
	Tesla.Migration.client_function!()
	end
	end
	end

	defp gen_deprecated(_method, _safe, _, _opts), do: nil

	defp name(method, :safe), do: method
	defp name(method, :bang), do: String.to_atom("#{method}!")

	defp req(:safe), do: :request
	defp req(:bang), do: :request!

	defp types(method, client, opts), do: type(client) ++ type(:url) ++ type(method) ++ type(opts)

	defp type(:safe), do: quote(do: Tesla.Env.result())
	defp type(:bang), do: quote(do: Tesla.Env.t() \| no_return)

	defp type(:client), do: [quote(do: Tesla.Env.client())]
	defp type(:noclient), do: []
	defp type(:opts), do: [quote(do: [option])]
	defp type(:noopts), do: []
	defp type(:url), do: [quote(do: Tesla.Env.url())]
	defp type(method) when method in @body, do: [quote(do: Tesla.Env.body())]
	defp type(_method), do: []

	defp inputs(method, client, opts),
	do: input(client) ++ input(:url) ++ input(method) ++ input(opts)

	defp input(:client), do: [quote(do: %Tesla.Client{} = client)]
	defp input(:noclient), do: []
	defp input(:opts), do: [quote(do: opts)]
	defp input(:noopts), do: []
	defp input(:url), do: [quote(do: url)]
	defp input(method) when method in @body, do: [quote(do: body)]
	defp input(_method), do: []

	defp outputs(method, client, opts), do: output(client) ++ [output(output(method), opts)]
	defp output(:client), do: [quote(do: client)]
	defp output(:noclient), do: []
	defp output(m) when m in @body, do: quote(do: [method: unquote(m), url: url, body: body])
	defp output(m), do: quote(do: [method: unquote(m), url: url])
	defp output(prev, :opts), do: quote(do: unquote(prev) ++ opts)
	defp output(prev, :noopts), do: prev
	end

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