Lua

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.

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Lua

local chilkat = require("chilkat")

local rest = chilkat.Rest.new()
local bTls = true
local bAutoReconnect = true
local success = rest:connect("example.com", 443, bTls, bAutoReconnect)
if not success then
    print(rest.last_error_text)
    return
end

-- Configure one multipart part before sending.
rest.part_selector = "1"
rest:add_header("Content-Type", "text/plain")
rest:add_header("Content-Disposition", "form-data; name=\"field1\"")
success = rest:set_multipart_body_string("value1")
if not success then
    print(rest.last_error_text)
    return
end

-- Send the multipart request using the configured parts.
success = rest:send_req_multipart("POST", "/api/upload")
if not success then
    print(rest.last_error_text)
    return
end

-- 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.
local statusCode = rest:read_response_header()
if statusCode < 0 then
    print(rest.last_error_text)
    return
end

print("Response status code: " .. statusCode)

-- Read the response body as text.
local responseBody = rest:read_resp_body_string()
if not rest.last_method_success then
    print(rest.last_error_text)
    return
end

print(responseBody)