decompress_body: Don't crash on unknown codec, closes: #216

lib/req/steps.ex

@@ -813,7 +813,7 @@ defmodule Req.Steps do
   | gzip, x-gzip  | `:zlib.gunzip/1`                                |
   | br            | `:brotli.decode/1` (if [brotli] is installed)   |
   | zstd          | `:ezstd.decompress/1` (if [ezstd] is installed) |
-  | identity      | Returns data as is                              |
+  | _other_       | Returns data as is                              |
 
   ## Options
 
@@ -887,8 +887,8 @@ defmodule Req.Steps do
     body
   end
 
-  defp decompress_with_algorithm(algorithm, _body) do
-    raise("unsupported decompression algorithm: #{inspect(algorithm)}")
+  defp decompress_with_algorithm(_algorithm, body) do
+    body
   end
 
   defmacrop nimble_csv_loaded? do

test/req/steps_test.exs

@@ -286,7 +286,6 @@ defmodule Req.StepsTest do
       assert Req.get!(c.url).body == "foo"
     end
 
-    @tag :capture_log
     test "zstd", c do
       Bypass.expect(c.bypass, "GET", "/", fn conn ->
         conn
@@ -296,6 +295,18 @@ defmodule Req.StepsTest do
 
       assert Req.get!(c.url).body == "foo"
     end
+
+    test "unknown codec", c do
+      Bypass.expect(c.bypass, "GET", "/", fn conn ->
+        conn
+        |> Plug.Conn.put_resp_header("content-encoding", "unknown")
+        |> Plug.Conn.send_resp(200, <<1, 2, 3>>)
+      end)
+
+      resp = Req.get!(c.url)
+      assert Req.Response.get_header(resp, "content-encoding") == ["unknown"]
+      assert resp.body == <<1, 2, 3>>
+    end
   end
 
   describe "output" do