diff --git a/lib/playwright/api_request.ex b/lib/playwright/api_request.ex
index aff4f18..1be92de 100644
--- a/lib/playwright/api_request.ex
+++ b/lib/playwright/api_request.ex
@@ -15,6 +15,9 @@ defmodule Playwright.APIRequest do
   alias Playwright.APIRequestContext
   alias Playwright.SDK.Channel
 
+  # structs & types
+  # ----------------------------------------------------------------------------
+
   @enforce_keys [:guid, :session]
   defstruct [:guid, :session]
 
@@ -101,6 +104,9 @@ defmodule Playwright.APIRequest do
           required(:value) => String.t()
         }
 
+  # API
+  # ----------------------------------------------------------------------------
+
   @doc """
   Returns a new `Playwright.APIRequest`.
 
diff --git a/lib/playwright/api_request_context.ex b/lib/playwright/api_request_context.ex
index 60ad0d6..340e4c5 100644
--- a/lib/playwright/api_request_context.ex
+++ b/lib/playwright/api_request_context.ex
@@ -59,7 +59,7 @@ defmodule Playwright.APIRequestContext do
   alias Playwright.API.Error
   alias Playwright.SDK.Channel
 
-  # types
+  # structs & types
   # ----------------------------------------------------------------------------
 
   @typedoc "Options for the various request types."
diff --git a/lib/playwright/api_response.ex b/lib/playwright/api_response.ex
index 92e35b8..28f4556 100644
--- a/lib/playwright/api_response.ex
+++ b/lib/playwright/api_response.ex
@@ -18,6 +18,9 @@ defmodule Playwright.APIResponse do
   alias Playwright.API.Error
   alias Playwright.SDK.Channel
 
+  # structs & types
+  # ----------------------------------------------------------------------------
+
   defstruct [:context, :fetchUid, :headers, :status, :statusText, :url]
 
   @typedoc """
@@ -35,6 +38,9 @@ defmodule Playwright.APIResponse do
   @typedoc "Data serializable as JSON."
   @type serializable() :: list() | map()
 
+  # API
+  # ----------------------------------------------------------------------------
+
   @doc """
   Returns a `Playwright.APIResponse` hydrated from the provided `properties`.
 
@@ -171,6 +177,10 @@ defmodule Playwright.APIResponse do
   Returns a boolean indicating whether the response was successful.
 
   Success means the response status code is within the range of `200-299`.
+
+  ## Returns
+
+  - `boolean()`
   """
   @pipe {:ok, [:response]}
   @spec ok(t()) :: boolean()
diff --git a/lib/playwright/sdk/channel.ex b/lib/playwright/sdk/channel.ex
index 2a2196e..d51853f 100644
--- a/lib/playwright/sdk/channel.ex
+++ b/lib/playwright/sdk/channel.ex
@@ -52,7 +52,7 @@ defmodule Playwright.SDK.Channel do
   @spec post({resource(), atom() | String.t()}, map(), map()) :: any() | {:error, any()}
   def post({resource, action}, params \\ %{}, options \\ %{})
       when is_struct(resource)
-      when is_atom(action) do
+      when is_atom(action) or is_binary(action) do
     {refresh?, params} = Map.pop(Map.merge(%{refresh: true}, Map.merge(params, options)), :refresh)
     connection = Session.connection(resource.session)
     message = Message.new(resource.guid, action, params)
diff --git a/test/api/api_response_test.exs b/test/api/api_response_test.exs
index 699e3cd..3d6c14b 100644
--- a/test/api/api_response_test.exs
+++ b/test/api/api_response_test.exs
@@ -1,10 +1,47 @@
 defmodule Playwright.APIResponseTest do
   use Playwright.TestCase, async: true
+  alias Playwright.API.Error
   alias Playwright.APIRequest
   alias Playwright.APIResponse
   alias Playwright.APIRequestContext
 
-  describe "APIResponse.dispose/" do
+  describe "APIResponse.body/1" do
+    test "on success, returns response body", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+
+      assert "{\"foo\": \"bar\"}\n" = APIResponse.body(response)
+    end
+
+    test "on failure, returns `{:error, error}`", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+      response = %{response | fetchUid: "bogus"}
+
+      assert {:error, %Error{type: "ResponseError"}} = APIResponse.body(response)
+    end
+
+    test "on HTTP error, returns status code as the response body", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/bogus.json")
+
+      assert "404" = APIResponse.body(response)
+    end
+  end
+
+  describe "APIResponse.body!/1" do
+    test "on failure, raises", %{assets: assets, session: session} do
+      assert_raise RuntimeError, fn ->
+        request = Playwright.request(session) |> APIRequest.new_context()
+        response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+        response = %{response | fetchUid: "bogus"}
+
+        APIResponse.body!(response)
+      end
+    end
+  end
+
+  describe "APIResponse.dispose/1" do
     test "on success, causes subsequent usage of `APIResponse` to fail", %{assets: assets, session: session} do
       request = Playwright.request(session) |> APIRequest.new_context()
       response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
@@ -12,5 +49,161 @@ defmodule Playwright.APIResponseTest do
       assert :ok = APIResponse.dispose(response)
       assert {:error, %{type: "ResponseError", message: "Response has been disposed"}} = APIResponse.body(response)
     end
+
+    test "on failure, returns `{:error, error}`", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+      response = %{response | context: %{guid: "bogus", session: session}}
+
+      assert {:error, %Error{type: "TargetClosedError"}} = APIResponse.dispose(response)
+    end
+  end
+
+  describe "APIResponse.dispose!/1" do
+    test "on failure, raises", %{assets: assets, session: session} do
+      assert_raise RuntimeError, fn ->
+        request = Playwright.request(session) |> APIRequest.new_context()
+        response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+        response = %{response | context: %{guid: "bogus", session: session}}
+
+        APIResponse.dispose!(response)
+      end
+    end
+  end
+
+  describe "APIResponse.header/1" do
+    test "on success, returns the value of the HTTP header", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+
+      assert "application/json" = APIResponse.header(response, "content-type")
+    end
+
+    test "when the HTTP header is not found, returns `nil`", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+
+      assert APIResponse.header(response, "bogus") == nil
+    end
+  end
+
+  describe "APIResponse.header!/1" do
+    test "on success, returns the value of the HTTP header", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+
+      assert "application/json" = APIResponse.header(response, "content-type")
+    end
+
+    # @tag :skip
+    # ...haven't found a way to fail
+    # test "on failure, raises", %{assets: assets, session: session} do
+    # end
+  end
+
+  describe "APIResponse.headers/1" do
+  end
+
+  describe "APIResponse.headers!/1" do
+  end
+
+  describe "APIResponse.json/1" do
+    test "on success, returns response body", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+
+      assert %{"foo" => "bar"} = APIResponse.json(response)
+    end
+
+    test "on failure, returns `{:error, error}`", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+      response = %{response | fetchUid: "bogus"}
+
+      assert {:error, %Error{type: "ResponseError"}} = APIResponse.json(response)
+    end
+
+    test "on HTTP error, returns status code as the response body", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/bogus.json")
+
+      assert 404 = APIResponse.json(response)
+    end
+  end
+
+  describe "APIResponse.json!/1" do
+    test "on failure, raises", %{assets: assets, session: session} do
+      assert_raise RuntimeError, fn ->
+        request = Playwright.request(session) |> APIRequest.new_context()
+        response = APIRequestContext.fetch(request, assets.prefix <> "/simple.json")
+        response = %{response | fetchUid: "bogus"}
+
+        APIResponse.json!(response)
+      end
+    end
+  end
+
+  describe "APIResponse.ok/1" do
+    test "is true when the response status code is in the range, 200-299" do
+      range = 200..299
+
+      Enum.each(range, fn code ->
+        assert APIResponse.ok(%APIResponse{status: code})
+      end)
+    end
+
+    test "is true when the response status code is 0" do
+      assert APIResponse.ok(%APIResponse{status: 0})
+    end
+
+    test "is false otherwise" do
+      range = 1..199
+
+      Enum.each(range, fn code ->
+        refute APIResponse.ok(%APIResponse{status: code})
+      end)
+
+      range = 300..999
+
+      Enum.each(range, fn code ->
+        refute APIResponse.ok(%APIResponse{status: code})
+      end)
+    end
+  end
+
+  describe "APIResponse.text/1" do
+    test "on success, returns response body", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/empty.html")
+
+      assert APIResponse.text(response) == ""
+    end
+
+    test "on failure, returns `{:error, error}`", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/empty.html")
+      response = %{response | fetchUid: "bogus"}
+
+      assert {:error, %Error{type: "ResponseError"}} = APIResponse.text(response)
+    end
+
+    test "on HTTP error, returns status code as the response body", %{assets: assets, session: session} do
+      request = Playwright.request(session) |> APIRequest.new_context()
+      response = APIRequestContext.fetch(request, assets.prefix <> "/bogus.text")
+
+      assert "404" = APIResponse.text(response)
+    end
+  end
+
+  describe "APIResponse.text!/1" do
+    test "on failure, raises", %{assets: assets, session: session} do
+      assert_raise RuntimeError, fn ->
+        request = Playwright.request(session) |> APIRequest.new_context()
+        response = APIRequestContext.fetch(request, assets.prefix <> "/empty.html")
+        response = %{response | fetchUid: "bogus"}
+
+        APIResponse.text!(response)
+      end
+    end
   end
 end