Truncated body string when using REST Webservice

[#1]

Dear expert,

I'm using REST Webservice to POST data from REST API JSON, but i had a problem when i concatenate all the body of JSON then the string is truncated. Does anyone have the answer for this problem ?

So when I continue the WebServiceUtilities library, it told that the content of Body is fault and domain is invalid.

Thanks and Best Regards,

Duy.