I generate CSR file using the following commands:
openssl genrsa -out demo.key 2048
openssl req -new -utf8 -key demo.key -out demo.csr -subj "/CN=测试"
OpenSSL-webterm indicated an error.
req: subject name is expected to be in the format /type0=value0/type1=value1/type2=... where characters may be escaped by . This name is not in that format: '"/CN=₩ᄉヒ│ᆵユVPN2"'