Greetings friends, from today I can not go in to the releases, the answer I get is the following, 400 bad request, the query is, is there a problem on the web, or the problem is mine and I should of done, thank you very much.

400 means that the request was malformed. In other words, the data stream sent by the client to the server didn't follow the rules.

In the case of a REST API with a JSON payload, 400's are typically, and correctly I would say, used to indicate that the JSON is invalid in some way according to the API specification for the service.