curl -X POST https://cvm.tencentcloudapi.com \\
-H "Authorization: TC3-HMAC-SHA256 Credential=AKIDz8krbsJ5**********mLPx3EXAMPLE/2019-02-25/cvm/tc3_request, SignedHeaders=content-type;host, Signature=72e494ea8******************************************a96525168" \\
-H "Content-Type: application/json; charset=utf-8" \\
-H "Host: cvm.tencentcloudapi.com" \\
-H "X-TC-Action: DescribeInstances" \\
-H "X-TC-Timestamp: 1551113065" \\
-H "X-TC-Version: 2017-03-12" \\
-H "X-TC-Region: ap-guangzhou" \\
-d '{"Limit": 1, "Filters": [{"Values": ["\\u672a\\u547d\\u540d"], "Name": "instance-name"}]}'

CanonicalRequest =
    HTTPRequestMethod + '\\n' +
    CanonicalURI + '\\n' +
    CanonicalQueryString + '\\n' +
    CanonicalHeaders + '\\n' +
    SignedHeaders + '\\n' +
    HashedRequestPayload

POST
/

content-type:application/json; charset=utf-8
host:cvm.tencentcloudapi.com

content-type;host
35e9c5b0e3ae67532d3c9f17ead6c90222632e5b1ff7f6e89887f1398934f064

StringToSign =
    Algorithm + \\n +
    RequestTimestamp + \\n +
    CredentialScope + \\n +
    HashedCanonicalRequest

TC3-HMAC-SHA256
1551113065
2019-02-25/cvm/tc3_request
5ffe6a04c0664d6b969fab9a13bdab201d63ee709638e2749d62a09ca18d7031

    const kDate = sha256(date, 'TC3' + SECRET_KEY)
    const kService = sha256(service, kDate)
    const kSigning = sha256('tc3_request', kService)
    const signature = sha256(stringToSign, kSigning, 'hex')

Authorization =
    Algorithm + ' ' +
    'Credential=' + SecretId + '/' + CredentialScope + ', ' +
    'SignedHeaders=' + SignedHeaders + ', ' +
    'Signature=' + Signature

TC3-HMAC-SHA256 Credential=AKIDz8krbsJ5**********mLPx3EXAMPLE/2019-02-25/cvm/tc3_request, SignedHeaders=content-type;host, Signature=72e494ea8******************************************a96525168

POST https://cvm.tencentcloudapi.com/
Authorization: TC3-HMAC-SHA256 Credential=AKIDz8krbsJ5**********mLPx3EXAMPLE/2019-02-25/cvm/tc3_request, SignedHeaders=content-type;host, Signature=72e494ea8******************************************a96525168
Content-Type: application/json; charset=utf-8
Host: cvm.tencentcloudapi.com
X-TC-Action: DescribeInstances
X-TC-Version: 2017-03-12
X-TC-Timestamp: 1551113065
X-TC-Region: ap-guangzhou

{"Limit": 1, "Filters": [{"Values": ["\\u672a\\u547d\\u540d"], "Name": "instance-name"}]}

const crypto = require('crypto');

function sha256(message, secret = '', encoding) {
    const hmac = crypto.createHmac('sha256', secret)
    return hmac.update(message).digest(encoding)
}
function getHash(message, encoding = 'hex') {
    const hash = crypto.createHash('sha256')
    return hash.update(message).digest(encoding)
}
function getDate(timestamp) {
    const date = new Date(timestamp * 1000)
    const year = date.getUTCFullYear()
    const month = ('0' + (date.getUTCMonth() + 1)).slice(-2)
    const day = ('0' + date.getUTCDate()).slice(-2)
    return `${year}-${month}-${day}`
}
function main(){
    // シークレットキーパラメータ
    const SECRET_ID = "AKIDz8krbsJ5**********mLPx3EXAMPLE"
    const SECRET_KEY = "Gu5t9xGAR***********EXAMPLE"

    const endpoint = "cvm.tencentcloudapi.com"
    const service = "cvm"
    const region = "ap-guangzhou"
    const action = "DescribeInstances"
    const version = "2017-03-12"
    //const timestamp = getTime()
    const timestamp = 1551113065
    // 時間処理, 世界時間の日付の取得
    const date = getDate(timestamp)

    // ************* ステップ 1：正規リクエスト文字列の連結 *************
    const signedHeaders = "content-type;host"

    const payload = "{\\"Limit\\": 1, \\"Filters\\": [{\\"Values\\": [\\"\\\\u672a\\\\u547d\\\\u540d\\"], \\"Name\\": \\"instance-name\\"}]}"

    const hashedRequestPayload = getHash(payload);
    const httpRequestMethod = "POST"
    const canonicalUri = "/"
    const canonicalQueryString = ""
    const canonicalHeaders = "content-type:application/json; charset=utf-8\\n" + "host:" + endpoint + "\\n"

    const canonicalRequest = httpRequestMethod + "\\n"
                         + canonicalUri + "\\n"
                         + canonicalQueryString + "\\n"
                         + canonicalHeaders + "\\n"
                         + signedHeaders + "\\n"
                         + hashedRequestPayload
    console.log(canonicalRequest)
    console.log("----------------------------")

    // ************* ステップ 2：署名対象文字列を連結する *************
    const algorithm = "TC3-HMAC-SHA256"
    const hashedCanonicalRequest = getHash(canonicalRequest);
    const credentialScope = date + "/" + service + "/" + "tc3_request"
    const stringToSign = algorithm + "\\n" +
                    timestamp + "\\n" +
                    credentialScope + "\\n" +
                    hashedCanonicalRequest
    console.log(stringToSign)
    console.log("----------------------------")

    // ************* ステップ 3：署名を計算する *************
    const kDate = sha256(date, 'TC3' + SECRET_KEY)
    const kService = sha256(service, kDate)
    const kSigning = sha256('tc3_request', kService)
    const signature = sha256(stringToSign, kSigning, 'hex')
    console.log(signature)
    console.log("----------------------------")

    // ************* ステップ 4：Authorizationを連結する *************
    const authorization = algorithm + " " +
                    "Credential=" + SECRET_ID + "/" + credentialScope + ", " +
                    "SignedHeaders=" + signedHeaders + ", " +
                    "Signature=" + signature
    console.log(authorization)
    console.log("----------------------------")

    const Call_Information = 'curl -X POST ' + "https://" + endpoint
                           + ' -H "Authorization: ' + authorization + '"'
                           + ' -H "Content-Type: application/json; charset=utf-8"'
                           + ' -H "Host: ' + endpoint + '"'
                           + ' -H "X-TC-Action: ' + action + '"'
                           + ' -H "X-TC-Timestamp: ' + timestamp.toString() + '"'
                           + ' -H "X-TC-Version: ' + version + '"'
                           + ' -H "X-TC-Region: ' + region + '"'
                           + " -d '" + payload + "'"
    console.log(Call_Information)
}
main()

{
    'Action' : 'DescribeInstances',
    'InstanceIds.0' : 'ins-09dx96dg',
    'Limit' : 20,
    'Nonce' : 11886,  
    'Offset' : 0,
    'Region' : 'ap-guangzhou',
    'SecretId' : 'AKIDz8krbsJ5**********mLPx3EXAMPLE',
    'Timestamp' : 1465185768,
    'Version': '2017-03-12',
}

Action=DescribeInstances&InstanceIds.0=ins-09dx96dg&Limit=20&Nonce=11886&Offset=0&Region=ap-guangzhou&SecretId=AKIDz8krbsJ5**********mLPx3EXAMPLE&Timestamp=1465185768&Version=2017-03-12

GETcvm.tencentcloudapi.com/?Action=DescribeInstances&InstanceIds.0=ins-09dx96dg&Limit=20&Nonce=11886&Offset=0&Region=ap-guangzhou&SecretId=AKIDz8*****************MPLE&Timestamp=1465185768&Version=2017-03-12

Eli*****************cGeI=

# 実際の呼び出し、成功した場合、消費型APIであれば課金が発生する可能性があります（ここではPython言語を例としてgetリクエストを送信します）
resp = requests.get("https://" + endpoint, params=data)
print(resp.url)

最終的に得られるリクエスト文字列は
https://cvm.tencentcloudapi.com/?Action=DescribeInstances&InstanceIds.0=ins-09dx96dg&Limit=20&Nonce=11886&Offset=0&Region=ap-guangzhou&SecretId=AKIDz8krbsJ5**********mLPx3EXAMPLE&Signature=EliP***********************eI%3D&Timestamp=1465185768&Version=2017-03-12

const crypto = require('crypto');

function get_req_url(params, endpoint){
    params['Signature'] = escape(params['Signature']);
    const url_strParam = sort_params(params)
    return "https://" + endpoint + "/?" + url_strParam.slice(1);
}

function formatSignString(reqMethod, endpoint, path, strParam){
    let strSign = reqMethod + endpoint + path + "?" + strParam.slice(1);
    return strSign;
}
function sha1(secretKey, strsign){
    let signMethodMap = {'HmacSHA1': "sha1"};
    let hmac = crypto.createHmac(signMethodMap['HmacSHA1'], secretKey || "");
    return hmac.update(Buffer.from(strsign, 'utf8')).digest('base64')
}

function sort_params(params){
    let strParam = "";
    let keys = Object.keys(params);
    keys.sort();
    for (let k in keys) {
        //k = k.replace(/_/g, '.');
        strParam += ("&" + keys[k] + "=" + params[keys[k]]);
    }
    return strParam
}

function main(){
    // シークレットキーパラメータ
    const SECRET_ID = "AKIDz8krbsJ5**********mLPx3EXAMPLE"
    const SECRET_KEY = "Gu5t9xGAR***********EXAMPLE"

    const endpoint = "cvm.tencentcloudapi.com"
    const Region = "ap-guangzhou"
    const Version = "2017-03-12"
    const Action = "DescribeInstances"
    const Timestamp = 1465185768  // タイムスタンプ 2016-06-06 12:02:48。このパラメータはサンプルとして提供されており、実際の値に基づいて設定してください。
    // const Timestamp = Math.round(Date.now() / 1000)
    const Nonce = 11886  // ランダムな正の整数
    //const nonce = Math.round(Math.random() * 65535)

    let params = {};
    params['Action'] = Action;
    params['InstanceIds.0'] = 'ins-09dx96dg';
    params['Limit'] = 20;
    params['Offset'] = 0;
    params['Nonce'] = Nonce;
    params['Region'] = Region;
    params['SecretId'] = SECRET_ID;
    params['Timestamp'] = Timestamp;
    params['Version'] = Version;

    // 1. パラメータをソートし、リクエスト文字列を連結する
    strParam = sort_params(params)

    // 2. 署名原文文字列を連結する
    const reqMethod = "GET";
    const path = "/";
    strSign = formatSignString(reqMethod, endpoint, path, strParam)
    console.log(strSign)
    console.log("-----------------------")

    // 3. 署名文字列を生成する
    params['Signature'] = sha1(SECRET_KEY, strSign)
    console.log(params['Signature'])
    console.log("-----------------------")

    // 4. URLエンコードを行い、リクエストURLを連結する
    const req_url = get_req_url(params, endpoint)
    console.log(params['Signature'])
    console.log("-----------------------")
    console.log(req_url)
}
main()


{
    "Response": {
        "TotalCount": 0,
        "InstanceStatusSet": [],
        "RequestId": "b5b41468-520d-4192-b42f-595cc34b6c1c"
    }
}

{
    "Response": {
        "Error": {
            "Code": "AuthFailure.SignatureFailure",
            "Message": "The provided credentials could not be validated. Please check your signature is correct."
        },
        "RequestId": "ed93f3cb-f35e-473f-b9f3-0d451b8b79c6"
    }
}