Made sockets nonblocking (I'm a fool who didn't do this and spent several hours trying to figure out why I couldn't handle a second request if firefox was on the page I'm so dumb I hate myself I hate coding I hate the internet computers were a mistake)

src/responses.c

@@ -142,6 +142,7 @@ int sendResponse(Connection *conn, Sitefile *site) {
 					readResponse(conn, site->content[i].arg);
 					goto end;
 				default:
+					sendErrorResponse(conn, ERROR_500);
 					return 1;
 			}
 		}