C#

curl with Variable Substitution in the Request Body

See more CURL Examples

This example demonstrates using variables located in the request body with the {{variable_name}} syntax. C#

bool success = false;

//  Variables can also be used within the HTTP request body.
//  Variable names are enclosed between {{ and }}

//  Here is a curl command with two variables {{name}} and {{age}} located in the data.

//  curl -X POST https://api.example.com/data \
//    -H "Content-Type: application/json" \
//    -d '{"name":"{{name}}","age":{{age}}}'

Chilkat.StringBuilder sbCurl = new Chilkat.StringBuilder();
sbCurl.AppendLn("curl -X POST https://api.example.com/data \\");
sbCurl.AppendLn("  -H \"Content-Type: application/json\" \\");
sbCurl.AppendLn("  -d '{\"name\":\"{{name}}\",\"age\":{{age}}}'");

Chilkat.HttpCurl curl = new Chilkat.HttpCurl();

//  Provide values for variables.
curl.SetVar("name","Alice");
curl.SetVar("age","30");

//  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.
Chilkat.StringBuilder sbRawRequest = new Chilkat.StringBuilder();
success = curl.ToRawRequest(sbCurl.GetAsString(),sbRawRequest);
if (success == false) {
    Debug.WriteLine(curl.LastErrorText);
    return;
}

Debug.WriteLine(sbRawRequest.GetAsString());

//  Output:

//  POST /data HTTP/1.1
//  Host: api.example.com
//  Content-Type: application/json
//  Content-Length: 25
//  
//  {"name":"Alice","age":30}

//  --------------------------------------------------------------------------------------------------
//  Note: Variable substitution in the request body can be turned off by 
//  setting the EnableBodyVars property equal to false

curl.EnableBodyVars = false;

success = curl.ToRawRequest(sbCurl.GetAsString(),sbRawRequest);
if (success == false) {
    Debug.WriteLine(curl.LastErrorText);
    return;
}

Debug.WriteLine(sbRawRequest.GetAsString());

//  The raw request with body variable substitution disable:

//  Host: api.example.com
//  Content-Type: application/json
//  Content-Length: 33
//  
//  {"name":"{{name}}","age":{{age}}}