IOS WebService Soap Request encounters server 400 error

Because of too many parameters, the server passed the data (a=x&b=x) in a URL parameter, but encountered a server 400 error, and later discovered the reason because the URL contains special characters such as:&.

Because SOAP is the XML data request method,& is an illegal character of XML, so it is reported 400 error, then need to escape &, change & to & can be.

Character escapes see article: http://blog.csdn.net/assholeu/article/details/41649615

IOS WebService Soap Request encounters server 400 error