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HTTP client library, with support for middleware and multiple adapters.
Security advisory:
This version has known vulnerabilities.
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lib/tesla/middleware/follow_redirects.ex
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
%{status: status} = env when not status in @redirect_statuses ->
env
_ ->
raise Tesla.Error, "too many redirects"
end
end
defp redirect(env, next, left) do
case Tesla.run(env, next) do
%{status: status, headers: %{"location" => location}} when status in @redirect_statuses ->
location = parse_location(location, env)
redirect(%{env | url: location}, next, left - 1)
env ->
env
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