Added SimpleWeb::error, and simplified request size checks on server

tests/io_test.cpp

@@ -3,10 +3,6 @@
 #include "server_http.hpp"
 #include <future>
 
-#ifndef USE_STANDALONE_ASIO
-namespace asio = boost::asio;
-#endif
-
 using namespace std;
 
 using HttpServer = SimpleWeb::Server<SimpleWeb::HTTP>;
@@ -363,7 +359,7 @@ int main() {
         }
         else if(call_num == 3) {
           ASSERT(response->content.string().empty());
-          ASSERT(ec == asio::error::eof);
+          ASSERT(ec == SimpleWeb::error::eof);
         }
         ++call_num;
       });