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我想发送带签名标题的http消息。有些东西像:Libcurl是否支持签名标题
POST/HTTP/1.1
Host: server.com
Content-Type: text/xml; charset=utf-8
Content-Length: 8
Signature: 42A424FB0C4938BBF08259514C64ABFC1E74C61F
any data
签名头包含40个字符的十六进制表示的HMAC-SHA1 (Key, Text)