nginx modifying the jsonp response message

[venkat]

Hi, 

We are creating a web api application. In one of our API's if there are any
validation errors, we are returning the error message in JSONP format. In
the API Request URL user adds a query string parameter
?jsoncallback=xxxxxxxxxx.

On validation failure we are throwing a 400 bad request JSONP with response
message in the below format.

xxxxxxxxxx({"error","error message"})

It is working good in all the environments, where there is no nginx. In our
staging environment we have nginx configured. 

Here it is modifying the output as below. 

badrequest{"error","error message"})

Because of this our front end application is unable to read the response
message. 

Could you please let me know, what configuration setting of nginx could
cause this problem?

Thanks in Advance
Venkat.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,230799,230799#msg-230799