Bad request 400 problem

I use Web_api module in my app and ı have an error named bad request 400.I check the flask with my browser and it works. How can ı fix this problem.

Take a look through this post here.

In short it would appear that you have something wrong in the request.

A 400 (Bad Request) status code indicates that a server is unable or unwilling to process a request due to a client error.