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lib/crawly/middlewares/user_agent.ex
defmodule Crawly.Middlewares.UserAgent do
@moduledoc """
Set/Rotate user agents for crawling. The user agents are read from
:crawly, :user_agents sessions.
The default value for the user agent is: Crawly Bot 1.0
"""
require Logger
def run(request, state) do
new_headers = List.keydelete(request.headers, "User-Agent", 0)
user_agents = Application.get_env(:crawly, :user_agents, ["Crawly Bot 1.0"])
useragent = Enum.random(user_agents)
new_request =
Map.put(request, :headers, [{"User-Agent", useragent} | new_headers])
{new_request, state}
end
end