golang的http库遵循rfc的标准协议 ，会将所有的header参数使用大驼峰的方式进行下标修正
header.set方法或者add方法都在标准库中使用下面这个函数对下标进行修正

// CanonicalMIMEHeaderKey returns the canonical format of the // MIME header key s. The canonicalization converts the first // letter and any letter following a hyphen to upper case; // the rest are converted to lowercase. For example, the // canonical key for "accept-encoding" is "Accept-Encoding". // MIME header keys are assumed to be ASCII only. // If s contains a space or invalid header field bytes, it is // returned without modifications. func CanonicalMIMEHeaderKey(s string) string {
   commonHeaderOnce.Do(initCommonHeader) // Quick check for canonical encoding.  upper := true  for i := 0; i < len(s); i++ {
      c := s[i] if !validHeaderFieldByte(c) { return s
      } if upper && 'a' <= c && c <= 'z' { return canonicalMIMEHeaderKey([]byte(s))
      } if !upper && 'A' <= c && c <= 'Z' { return canonicalMIMEHeaderKey([]byte(s))
      }
      upper = c == '-'  } return s
}

可以使用以下方法进行修正头部参数：

header := make(http.Header)
header[`accessToken`] = []string{accessToken}
header[`timestamp`] = []string{unixTime}
header[`accessKey`] = []string{this.chiefcloudsCoupon.AccessKey}
buffer := bytes.NewBuffer(paramsBytes)
request, err := http.NewRequest("POST", this.chiefcloudsCoupon.Domain, buffer) if err != nil { return nil, errors.New("三方接口配置异常")
}
request.Header = make(http.Header)
request.Header = header
request.Header.Set("Content-Type", "application/json;charset=UTF-8") //添加请求头