```
curl -d '{"url":"http://www.lemonde.fr/politiq"format":"badformat"}' --header "Content-Type: application/json" localhost:1970/url
```
```
TypeError: Cannot call method 'log' of undefined<br> at /home/marielle/Code/Node/citoid/lib/util.js:193:14<br> at Layer.handle_error (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/layer.js:58:5)<br> at trim_prefix (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:300:13)<br> at /home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:270:7<br> at Function.proto.process_params (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:321:12)<br> at next (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:261:10)<br> at Layer.handle_error (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/layer.js:54:12)<br> at trim_prefix (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:300:13)<br> at /home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:270:7<br> at Function.proto.process_params (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:321:12)<br> at next (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:261:10)<br> at Layer.handle_error (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/layer.js:54:12)<br> at trim_prefix (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:300:13)<br> at /home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:270:7<br> at Function.proto.process_params (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:321:12)<br> at next (/home/marielle/Code/Node/citoid/node_modules/express/lib/router/index.js:261:10)
``