+1 vote

In out Godot 3.1 project, we are trying to use the HTTPClient class to upload a file to a server. (A self-hosted Seafile instance, in this case).

As an initial test, we just send a string ("test test test test") as a text file.
The parentdir and relativepath form fields are expected by Seafile.

The code is largely copied from this tutorial.

extends Node2D

# HTTPClient demo
# This simple class can do HTTP requests; it will not block, but it needs to be polled.

func _init():
  var err = 0
  var http = HTTPClient.new() # Create the Client.

  err = http.connect_to_host(SEAFILE_URL, 443, true) # Connect to host/port.
  assert(err == OK) # Make sure connection was OK.

  # Wait until resolved and connected.
  while http.get_status() == HTTPClient.STATUS_CONNECTING or http.get_status() == HTTPClient.STATUS_RESOLVING:

    assert(http.get_status() == HTTPClient.STATUS_CONNECTED) # Could not connect

    var r = PoolByteArray()

  r.append("Content-Disposition: form-data; name=\"file\"; filename=\"test123.txt\"\r\n")
  r.append("Content-Type: text/plain\r\n\r\n")
  r.append("test test test test")
  r.append("Content-Disposition: form-data; name=\"relative_path\"\r\n\r\n")
  r.append("Content-Disposition: form-data; name=\"parent_dir\"\r\n\r\n")

  # Some headers
  var headers = [
      "Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW; charset=utf-8",
      "Content-Length: " + str(r.size())

  print("sending: " + r.get_string_from_utf8())

  err = http.request_raw(HTTPClient.METHOD_POST, "/seafhttp/upload-aj/TOKEN", headers, r) # Request a page from the site (this one was chunked..)
  assert(err == OK) # Make sure all is OK.

  while http.get_status() == HTTPClient.STATUS_REQUESTING:
      # Keep polling for as long as the request is being processed.
      if not OS.has_feature("web"):
          # Synchronous HTTP requests are not supported on the web,
          # so wait for the next main loop iteration.
          yield(Engine.get_main_loop(), "idle_frame")

  assert(http.get_status() == HTTPClient.STATUS_BODY or http.get_status() == HTTPClient.STATUS_CONNECTED) # Make sure request finished well.

  print("response? ", http.has_response()) # Site might not have a response.

  if http.has_response():
      # If there is a response...

      headers = http.get_response_headers_as_dictionary() # Get response headers.
      print("code: ", http.get_response_code()) # Show response code.
      print("**headers:\\n", headers) # Show headers.

     # Getting the HTTP Body

      if http.is_response_chunked():
          # Does it use chunks?
          print("Response is Chunked!")
          # Or just plain Content-Length
          var bl = http.get_response_body_length()
          print("Response Length: ",bl)

      # This method works for both anyway

      var rb = PoolByteArray() # Array that will hold the data.

      while http.get_status() == HTTPClient.STATUS_BODY:
          # While there is body left to be read
          var chunk = http.read_response_body_chunk() # Get a chunk.
          if chunk.size() == 0:
              # Got nothing, wait for buffers to fill a bit.
              rb = rb + chunk # Append to read buffer.

      # Done!

      print("bytes got: ", rb.size())
      var text = rb.get_string_from_ascii()
      print("Text: ", text)

Apparently, the file is not send correctly to the server, because the server always responds: {"error": "No file."}

Conversely, this Java/OkHttp code here does essentially the same thing, and the request succeeds, the file is uploaded to the server successfully:

public static void main(String[] args) throws IOException {
    HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
    OkHttpClient client = new OkHttpClient.Builder()

    MediaType mediaType = MediaType.parse("multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW");
    RequestBody body = RequestBody.create(mediaType,
            "------WebKitFormBoundary7MA4YWxkTrZu0gW" +
                    "\r\nContent-Disposition: form-data; name=\"file\"; fileName=\"test123.txt\"" +
                    "\r\nContent-Type: text/plain" +
                    "\r\n\r\ntest test test test\r\n" +
                    "------WebKitFormBoundary7MA4YWxkTrZu0gW" +
                    "\r\nContent-Disposition: form-data; name=\"relative_path\"" +
                    "\r\n\r\nSaveFiles\r\n" +
                    "------WebKitFormBoundary7MA4YWxkTrZu0gW" +
                    "\r\nContent-Disposition: form-data; name=\"parent_dir\"" +
                    "\r\n\r\n/\r\n" +
    okhttp3.Request request = new Request.Builder()
            .addHeader("content-type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW")

    Response response = client.newCall(request).execute();

Does anybody know what we're doing wrong?

asked Apr 4, 2019 in Engine by Karen S. (13 points)

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