Add UniformResourceLocator::empty

modules/beast_asio/http/UniformResourceLocator.cpp

@@ -69,6 +69,11 @@ UniformResourceLocator& UniformResourceLocator::operator= (UniformResourceLocato
 
 //------------------------------------------------------------------------------
 
+bool UniformResourceLocator::empty () const
+{
+    return m_scheme == String::empty;
+}
+
 String UniformResourceLocator::scheme () const
 {
     return m_scheme;

modules/beast_asio/http/UniformResourceLocator.h

@@ -46,6 +46,9 @@ public:
     /** Copy assign a URL. */
     UniformResourceLocator& operator= (UniformResourceLocator const& other);
 
+    /** Returns `true` if this is an empty URL. */
+    bool empty () const;
+
     /** Returns the scheme of the URL.
         If no scheme was specified, the string will be empty.
     */