JavaScript

Send a Staged Multipart REST Request

Demonstrates Rest.SendReqMultipart, which sends a multipart request using the parts configured on the object, then reads the response in separate steps.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

var rest = new CkRest();
var bTls = true;
var bAutoReconnect = true;
success = rest.Connect("example.com",443,bTls,bAutoReconnect);
if (success == false) {
    console.log(rest.LastErrorText);
    return;
}

//  Configure one multipart part before sending.
rest.PartSelector = "1";
rest.AddHeader("Content-Type","text/plain");
rest.AddHeader("Content-Disposition","form-data; name=\"field1\"");
success = rest.SetMultipartBodyString("value1");
if (success == false) {
    console.log(rest.LastErrorText);
    return;
}

//  Send the multipart request using the configured parts.
success = rest.SendReqMultipart("POST","/api/upload");
if (success == false) {
    console.log(rest.LastErrorText);
    return;
}

//  After sending, read the response status line and header fields.  The return value is the HTTP
//  status code, or -1 if no response was received.
var statusCode = rest.ReadResponseHeader();
if (statusCode < 0) {
    console.log(rest.LastErrorText);
    return;
}

console.log("Response status code: " + statusCode);

//  Read the response body as text.
var responseBody = rest.ReadRespBodyString();
if (rest.LastMethodSuccess == false) {
    console.log(rest.LastErrorText);
    return;
}

console.log(responseBody);