@spec build_url(Tesla.Env.t()) :: String.t()

Builds a URL from the given Tesla.Env.t/0 struct.

Combines the url and query fields, and allows specifying the encoding strategy before calling build_url/3.

@spec build_url(Tesla.Env.url(), Tesla.Env.query(), encoding_strategy()) :: binary()

Builds URL with the given URL and query params.

Useful when you need to create a URL with dynamic query params from a Keyword list

Allows to specify the encoding strategy to be one either :www_form or :rfc3986. Read more about encoding at URI.encode_query/2.

• url - the base URL to which the query params will be appended.
• query - a list of key-value pairs to be encoded as query params.
• encoding - the encoding strategy to use. Defaults to :www_form

Examples

iex> Tesla.build_url("https://api.example.com", [user: 3, page: 2])
"https://api.example.com?user=3&page=2"

URL that already contains query params:

iex> url = "https://api.example.com?user=3"
iex> Tesla.build_url(url, [page: 2, status: true])
"https://api.example.com?user=3&page=2&status=true"

Default encoding :www_form:

iex> Tesla.build_url("https://api.example.com", [user_name: "John Smith"])
"https://api.example.com?user_name=John+Smith"

Specified encoding strategy :rfc3986:

iex> Tesla.build_url("https://api.example.com", [user_name: "John Smith"], :rfc3986)
"https://api.example.com?user_name=John%20Smith"

@spec client([Tesla.Client.middleware()], Tesla.Client.adapter()) :: Tesla.Client.t()

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
  @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)

@spec delete(Tesla.Env.client(), Tesla.Env.url(), [option()]) :: Tesla.Env.result()

Perform a DELETE request.

See request/1 or request/2 for options definition.

delete("/users")
delete("/users", query: [scope: "admin"])
delete(client, "/users")
delete(client, "/users", query: [scope: "admin"])
delete(client, "/users", body: %{name: "Jon"})

@spec delete!(Tesla.Env.client(), Tesla.Env.url(), [option()]) ::
  Tesla.Env.t() | no_return()

Perform a DELETE request.

See request!/1 or request!/2 for options definition.

delete!("/users")
delete!("/users", query: [scope: "admin"])
delete!(client, "/users")
delete!(client, "/users", query: [scope: "admin"])
delete!(client, "/users", body: %{name: "Jon"})

@spec get(Tesla.Env.client(), Tesla.Env.url(), [option()]) :: Tesla.Env.result()

Perform a GET request.

See request/1 or request/2 for options definition.

get("/users")
get("/users", query: [scope: "admin"])
get(client, "/users")
get(client, "/users", query: [scope: "admin"])
get(client, "/users", body: %{name: "Jon"})

@spec get!(Tesla.Env.client(), Tesla.Env.url(), [option()]) ::
  Tesla.Env.t() | no_return()

Perform a GET request.

See request!/1 or request!/2 for options definition.

get!("/users")
get!("/users", query: [scope: "admin"])
get!(client, "/users")
get!(client, "/users", query: [scope: "admin"])
get!(client, "/users", body: %{name: "Jon"})

@spec get_header(Tesla.Env.t(), binary()) :: binary() | nil

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 head(Tesla.Env.client(), Tesla.Env.url(), [option()]) :: Tesla.Env.result()

Perform a HEAD request.

See request/1 or request/2 for options definition.

head("/users")
head("/users", query: [scope: "admin"])
head(client, "/users")
head(client, "/users", query: [scope: "admin"])
head(client, "/users", body: %{name: "Jon"})

@spec head!(Tesla.Env.client(), Tesla.Env.url(), [option()]) ::
  Tesla.Env.t() | no_return()

Perform a HEAD request.

See request!/1 or request!/2 for options definition.

head!("/users")
head!("/users", query: [scope: "admin"])
head!(client, "/users")
head!(client, "/users", query: [scope: "admin"])
head!(client, "/users", body: %{name: "Jon"})

@spec options(Tesla.Env.client(), Tesla.Env.url(), [option()]) :: Tesla.Env.result()

Perform a OPTIONS request.

See request/1 or request/2 for options definition.

options("/users")
options("/users", query: [scope: "admin"])
options(client, "/users")
options(client, "/users", query: [scope: "admin"])
options(client, "/users", body: %{name: "Jon"})

@spec options!(Tesla.Env.client(), Tesla.Env.url(), [option()]) ::
  Tesla.Env.t() | no_return()

Perform a OPTIONS request.

See request!/1 or request!/2 for options definition.

options!("/users")
options!("/users", query: [scope: "admin"])
options!(client, "/users")
options!(client, "/users", query: [scope: "admin"])
options!(client, "/users", body: %{name: "Jon"})

@spec patch(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body(), [option()]) ::
  Tesla.Env.result()

Perform a PATCH request.

See request/1 or request/2 for options definition.

patch("/users", %{name: "Jon"})
patch("/users", %{name: "Jon"}, query: [scope: "admin"])
patch(client, "/users", %{name: "Jon"})
patch(client, "/users", %{name: "Jon"}, query: [scope: "admin"])

@spec patch!(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body(), [option()]) ::
  Tesla.Env.t() | no_return()

Perform a PATCH request.

See request!/1 or request!/2 for options definition.

patch!("/users", %{name: "Jon"})
patch!("/users", %{name: "Jon"}, query: [scope: "admin"])
patch!(client, "/users", %{name: "Jon"})
patch!(client, "/users", %{name: "Jon"}, query: [scope: "admin"])

@spec post(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body(), [option()]) ::
  Tesla.Env.result()

Perform a POST request.

See request/1 or request/2 for options definition.

post("/users", %{name: "Jon"})
post("/users", %{name: "Jon"}, query: [scope: "admin"])
post(client, "/users", %{name: "Jon"})
post(client, "/users", %{name: "Jon"}, query: [scope: "admin"])

@spec post!(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body(), [option()]) ::
  Tesla.Env.t() | no_return()

Perform a POST request.

See request!/1 or request!/2 for options definition.

post!("/users", %{name: "Jon"})
post!("/users", %{name: "Jon"}, query: [scope: "admin"])
post!(client, "/users", %{name: "Jon"})
post!(client, "/users", %{name: "Jon"}, query: [scope: "admin"])

@spec put(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body(), [option()]) ::
  Tesla.Env.result()

Perform a PUT request.

See request/1 or request/2 for options definition.

put("/users", %{name: "Jon"})
put("/users", %{name: "Jon"}, query: [scope: "admin"])
put(client, "/users", %{name: "Jon"})
put(client, "/users", %{name: "Jon"}, query: [scope: "admin"])

@spec put!(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body(), [option()]) ::
  Tesla.Env.t() | no_return()

Perform a PUT request.

See request!/1 or request!/2 for options definition.

put!("/users", %{name: "Jon"})
put!("/users", %{name: "Jon"}, query: [scope: "admin"])
put!(client, "/users", %{name: "Jon"})
put!(client, "/users", %{name: "Jon"}, query: [scope: "admin"])

@spec put_opt(Tesla.Env.t(), atom(), any()) :: Tesla.Env.t()

Adds given key/value pair to :opts field in Tesla.Env.

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

Examples

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

@spec request(Tesla.Env.client(), [option()]) :: Tesla.Env.result()

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 keyword 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")

# use shortcut methods
ExampleApi.get("/users/1")
ExampleApi.post(client, "/users", %{name: "Jon"})

@spec request!(Tesla.Env.client(), [option()]) :: Tesla.Env.t() | no_return()

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.

@spec trace(Tesla.Env.client(), Tesla.Env.url(), [option()]) :: Tesla.Env.result()

Perform a TRACE request.

See request/1 or request/2 for options definition.

trace("/users")
trace("/users", query: [scope: "admin"])
trace(client, "/users")
trace(client, "/users", query: [scope: "admin"])
trace(client, "/users", body: %{name: "Jon"})

@spec trace!(Tesla.Env.client(), Tesla.Env.url(), [option()]) ::
  Tesla.Env.t() | no_return()

Perform a TRACE request.

See request!/1 or request!/2 for options definition.

trace!("/users")
trace!("/users", query: [scope: "admin"])
trace!(client, "/users")
trace!(client, "/users", query: [scope: "admin"])
trace!(client, "/users", body: %{name: "Jon"})