Sending Multipart POST with attached File

Hi,

i want to upload a file created by the TWX Platform to an external System. The external api accepts POST requests with multipart/form-data. It requires that the file is attached to the "files" key.

A correct CURL command (that is working) is:

curl -u REDACTED:REDACTED -x POST --url "http://172.18.0.6:1080/archive" -F files=@testarchive.zip

Now i have two options with "ContentLoaderFunctions.PostMultipart" from TWX (that i know so far):

Send File from Repository

let params = {
 repository: "SystemRepository" /* STRING */,
 url: "http://172.18.0.6:1080/archive" /* STRING */,
 password: "REDACTED" /* STRING */,
 pathOnRepository: "/archive.zip" /* STRING */,
 username: "REDACTED" /* STRING */,
};

// result: JSON
result = Resources["ContentLoaderFunctions"].PostMultipart(params);

This creates a correct Multipart Request but the api requires that the File is attached to a "files" key not the created "file" key.

The intercepted request (https://www.mock-server.com/) has the following data:

{
 "method": "POST",
 "path": "/archive",
 "headers": {
 "content-length": [
 "31665"
 ],
 "User-Agent": [
 "Apache-HttpClient/4.5.13 (Java/11.0.14.1)"
 ],
 "Host": [
 "172.18.0.6:1080"
 ],
 "Content-Type": [
 "multipart/form-data; boundary=iTC1VvylIfQ9NzMkRnK6UPFNzUjrKcqoi63f"
 ],
 "Connection": [
 "Keep-Alive"
 ],
 "Accept-Encoding": [
 "gzip,deflate"
 ]
 },
 "keepAlive": true,
 "secure": false,
 "body": "--iTC1VvylIfQ9NzMkRnK6UPFNzUjrKcqoi63f\r\nContent-Disposition: form-data; name=\"file\"; filename=\"SourceControl_Test.zip\"\r\nContent-Type: application/zip\r\nContent-Transfer-Encoding: binary\r\n\r[STRIPPED]"
 }

Send Custom Multipart

const table = Resources["InfoTableFunctions"].CreateInfoTable();
table.AddField({ name: "files", baseType: "BLOB" });
table.AddRow({
 files: Things["SystemRepository"].LoadBinary({ path: "/archive.zip" }),
});

let params = {
 partsToSend: table /* INFOTABLE */,
 url: "http://172.18.0.6:1080/archive" /* STRING */,
 password: "REDACTED" /* STRING */,
 username: "REDACTED" /* STRING */,
};

// result: JSON
result = Resources["ContentLoaderFunctions"].PostMultipart(params);

This creates not a correct Multipart Request for the api (missing "files" field).

The intercepted request (https://www.mock-server.com/) has the following data:

{
 "method": "POST",
 "path": "/archive",
 "headers": {
 "content-length": [
 "42687"
 ],
 "User-Agent": [
 "Apache-HttpClient/4.5.13 (Java/11.0.14.1)"
 ],
 "Host": [
 "172.18.0.6:1080"
 ],
 "Content-Type": [
 "multipart/form-data; boundary=Gp8YexQsfUaP187g4AFJM0pGOoyxCXflEopmd-"
 ],
 "Connection": [
 "Keep-Alive"
 ],
 "Accept-Encoding": [
 "gzip,deflate"
 ]
 },
 "keepAlive": true,
 "secure": false,
 "body": "--Gp8YexQsfUaP187g4AFJM0pGOoyxCXflEopmd-\r\nContent-Disposition: form-data; name=\"files\"\r\nContent-Type: multipart/form-data; charset=ISO-8859-1\r\nContent-Transfer-Encoding: 8bit\r\n\r\nUEsDB[STRIPPED BASE64]"
 }

So is there any way to change the Fieldname in the first approach or to create a correct Multipart in the second case? or is there any other way i can use to upload a file to the external api?