LibWeb: Include headers HashMap in the LoadRequest::hash() calculation

Author: https://github.com/bgianfo
Commit: e92b576cba
Pull-request: https://github.com/SerenityOS/serenity/pull/9991
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/Loader/LoadRequest.h

@@ -34,8 +34,10 @@ public:
 
     unsigned hash() const
     {
-        // FIXME: Include headers in the hash as well
-        return pair_int_hash(pair_int_hash(m_url.to_string().hash(), m_method.hash()), string_hash((const char*)m_body.data(), m_body.size()));
+        auto body_hash = string_hash((const char*)m_body.data(), m_body.size());
+        auto body_and_headers_hash = pair_int_hash(body_hash, m_headers.hash());
+        auto url_and_method_hash = pair_int_hash(m_url.to_string().hash(), m_method.hash());
+        return pair_int_hash(body_and_headers_hash, url_and_method_hash);
     }
 
     bool operator==(const LoadRequest& other) const