从 OpenSSL 切换到 GNUTLS，关于证书路径的疑问。

OpenSSL 模式下各个证书路径，运行正常：

SSLEngine on
SSLCertificateFile "/usr/local/httpd/ssl/server.crt"
SSLCertificateKeyFile "/usr/local/httpd/ssl/server.key"
SSLCACertificateFile "/usr/local/httpd/ssl/server.ca.crt"

GnuTLS 模式下证书路径，搜索半天，不知怎么设置 server.ca.crt ，如果不设置，会报错“ SEC_ERROR_BAD_SIGNATURE ”

GnuTLSEnable on
GnuTLSPriorities NORMAL
GnuTLSCertificateFile /usr/local/httpd/ssl/server.crt
GnuTLSKeyFile /usr/local/httpd/ssl/server.key

多谢！