When i'm calling the URL in same way with minimum query string and hard coding those it's working. Please help me to get out of this problem. 2013-10-18 09:58:40,436 14651 ERROR ? werkzeug: 127.0.0.1 - - [18/Oct/2013 09:58:40] code 400, message Bad request syntax ('POST /createBankAccount?jobj={"uid":1,"db":"restful1","zip":"500081","compname":"santosh & co","bankname":"apna bank","street":"madhapur","date":"2013-10-18","actowner":"santosh","ifscCode":"12345","city":"hyd","openBalance":"980","actnum":"123456789","acttype":"current","branchName":"madhapur"} HTTP/1.1') 2013-10-18 09:58:40,436 14651 INFO ? werkzeug: 127.0.0.1 - - [18/Oct/2013 09:58:40] "POST /createBankAccount?jobj={"uid":1,"db":"restful1","zip":"500081","compname":"santosh & co","bankname":"apna bank","street":"madhapur","date":"2013-10-18","actowner":"santosh","ifscCode":"12345","city":"hyd","openBalance":"980","actnum":"123456789","acttype":"current","branchName":"madhapur"} HTTP/1.1" 400 -