Go Requires Chilkat v11.5.0+

curl with Variable Substitution in a JSON Request Body

See more CURL Examples

This example shows how to use variables inside a JSON request body using the {{variable_name}} syntax. When the HTTP request’s Content-Type indicates JSON, Chilkat automatically applies proper JSON escaping to each substituted value, ensuring the resulting JSON remains valid. Go

    success := false

    //  Variable names are enclosed between {{ and }}
    //  Important: The variable {{var_name}} should be placed inside the quotes.

    //  This is correct:
    //  curl -X POST https://api.example.com/messages \
    //    -H "Content-Type: application/json" \
    //    -d '{"text":"{{message}}"}'

    //  This is incorrect:
    //    -d '{"text":{{message}}}'

    sbCurl := chilkat.NewStringBuilder()
    sbCurl.AppendLn("curl -X POST https://api.example.com/messages \\")
    sbCurl.AppendLn("  -H \"Content-Type: application/json\" \\")
    sbCurl.AppendLn("  -d '{\"text\":\"{{message}}\"}'")

    curl := chilkat.NewHttpCurl()

    //  In this example, the value we'll provide for the "message" variable
    //  will contain chars that require JSON escaping.
    curl.SetVar("message","He said \"Hello, world!\"")

    //  To demonstrate how the variables are replaced, this example does not execute the curl command. 
    //  Instead, it generates the raw HTTP request that would be sent if the curl command were run.
    sbRawRequest := chilkat.NewStringBuilder()
    success = curl.ToRawRequest(*sbCurl.GetAsString(),sbRawRequest)
    if success == false {
        fmt.Println(curl.LastErrorText())
        sbCurl.DisposeStringBuilder()
        curl.DisposeHttpCurl()
        sbRawRequest.DisposeStringBuilder()
        return
    }

    fmt.Println(*sbRawRequest.GetAsString())

    //  The output is shown below.
    //  Notice that the quote chars around "Hello World!" are properly JSON escaped.

    //  POST /messages HTTP/1.1
    //  Host: api.example.com
    //  Content-Type: application/json
    //  Content-Length: 36
    //  
    //  {"text":"He said \"Hello, world!\""}

    sbCurl.DisposeStringBuilder()
    curl.DisposeHttpCurl()
    sbRawRequest.DisposeStringBuilder()