Different wfs clients support different character sets. The encoding of request body varies for different wfs client while sending the request. The encoding might be iso8859-1, utf-8, gbk, etc. Currently, WFS service uses different url addresses to make it compatible with different wfs clients.

WFS services:
Request body character set WFS URL
gb18030 https://iserver.supermap.io/iserver/services/data-world/wfs100/gb18030 Compatible with udig in Chinese environment
iso-8859-1 https://iserver.supermap.io/iserver/services/data-world/wfs100/iso-8859-1 Compatible with udig in English environment
utf-8 https://iserver.supermap.io/iserver/services/data-world/wfs100/utf-8
HTTP methods

Output formats