Add ability to allow all unknown hosts

Adds `page.driver.allow_unknown_hosts`.

README.md

@@ -139,6 +139,12 @@ page.driver.block_unknown_urls
 page.driver.allow_url 'example.com/*.js'
 ```
 
+**allow_unknown_urls**: Allow requests to all URLs. This will silence unknown URL warnings, or permit requests to all URLs when `block_unknown_urls` is used. Allowed URLs are reset on `Driver#reset!`.
+
+```ruby
+page.driver.allow_unknown_urls
+```
+
 Contributing
 ------------
 

lib/capybara/webkit/browser.rb

@@ -277,6 +277,10 @@ module Capybara::Webkit
       command("SetUnknownUrlMode", "block")
     end
 
+    def allow_unknown_urls
+      allow_url("*")
+    end
+
     private
 
     def check

lib/capybara/webkit/driver.rb

@@ -33,6 +33,10 @@ module Capybara::Webkit
       browser.block_unknown_urls
     end
 
+    def allow_unknown_urls
+      browser.allow_url("*")
+    end
+
     def current_url
       browser.current_url
     end

spec/driver_spec.rb

@@ -2685,6 +2685,26 @@ CACHE MANIFEST
         end
       end
 
+      it "can allow all hosts" do
+        driver.allow_unknown_urls
+        visit("/")
+
+        expect(stderr).not_to include("http://example.com/path")
+        expect(stderr).not_to include(driver.current_url)
+        driver.within_frame("frame") do
+          expect(driver.find("//body").first.text).not_to be_empty
+        end
+      end
+
+      it "resets allowed hosts on reset" do
+        driver.allow_unknown_urls
+        driver.reset!
+        visit("/")
+
+        expect(stderr).to include("http://example.com/path")
+        expect(stderr).not_to include(driver.current_url)        
+      end
+
       it "can block unknown hosts" do
         driver.block_unknown_urls
         visit("/")