Connection to localhost:8000 server?

Question

I am using the following code to attempt to connect to a local server I have set up using SimpleHTTPServer. However, every time i get the error message saying the the assertion has failed. I have tried numerous different url's in the connect function but nothing is working. I am unfamiliar with connecting to servers so any help would be greatly appreciated.

 func talkToServer(url, mode, data):
    # Connect to host/port
    HTTP = HTTPClient.new()
    RESPONSE = HTTP.connect("http://localhost:8000/", 8000)
    # Wait until resolved and connected
    while HTTP.get_status() == HTTPClient.STATUS_CONNECTING or HTTP.get_status() == HTTPClient.STATUS_RESOLVING:
        HTTP.poll()
        OS.delay_msec(300)
    # Error catch: Could not connect
    assert(HTTP.get_status() == HTTPClient.STATUS_CONNECTED)
    # Check for a GET or POST command
    if data == "":
        HEADERS =["User-Agent: Pirulo/1.0 (Godot)", "Accept: */*"]
        RESPONSE = HTTP.request(HTTPClient.METHOD_GET, url, HEADERS)
    else:
        QUERY = HTTP.query_string_from_dict(data)
        HEADERS = ["User-Agent: Pirulo/1.0 (Godot)", "Content-Type: application/x-www-form-urlencoded", "Content-Length: " + str(QUERY.length())]
        RESPONSE = HTTP.request(HTTPClient.METHOD_POST, url, HEADERS, QUERY)
    # Make sure all is OK
    assert(RESPONSE == OK)
    # Keep polling until the request is going on
    while (HTTP.get_status() == HTTPClient.STATUS_REQUESTING):
        HTTP.poll()
        OS.delay_msec(300)
    # Make sure request finished
    assert(HTTP.get_status() == HTTPClient.STATUS_BODY or HTTP.get_status() == HTTPClient.STATUS_CONNECTED)
    # Set up some variables
    var RB = RawArray()
    var CHUNK = 0
    var RESULT = 0
    # Raw data array
    if HTTP.has_response():
        # Get response headers
        var headers = HTTP.get_response_headers_as_dictionary()
        while HTTP.get_status() == HTTPClient.STATUS_BODY:
            HTTP.poll()
            CHUNK = HTTP.read_response_body_chunk()
            if(CHUNK.size() == 0):
                OS.delay_usec(100)
            else:
                RB = RB + CHUNK
            HTTP.close()
            RESULT = RB.get_string_from_ascii()

I am getting the following error message in my terminal:

127.0.0.1 - - [03/Oct/2017 17:01:57] code 501, message Unsupported method ('POST')
127.0.0.1 - - [03/Oct/2017 17:01:57] "POST blankJSON.json HTTP/1.1" 501 -

Answer 1

This is not a problem with Godot, but the way you're using Python's SimpleHTTPServer module.

The example code in the documentation does not support POST requests, but if you extend it with a custom handler class, you can get something that works for debugging purposes:

import SimpleHTTPServer
import SocketServer
import json

PORT = 8000

class Handler(SimpleHTTPServer.SimpleHTTPRequestHandler):
    def do_POST(self):
        self.send_response(200)
        self.send_header('Content-type', 'text/html')
        self.end_headers()

        self.wfile.write(json.dumps({"success": True}))

        content_length = int(self.headers['Content-Length'])
        json_string = self.rfile.read(content_length)
        data = json.loads(json_string)
        print data

httpd = SocketServer.TCPServer(("", PORT), Handler)

print "serving at port", PORT
httpd.serve_forever()

Note that the key here is to provide a handler which implements the do_POST() method.

You can test this back-end with a simple curl request:

curl -d '{"foo":"bar","baz":true}' http://localhost:8000

This is fine for the purpose of debugging, but if you plan on implementing a real back-end in Python, I would suggest using Flask instead, which comes with lots of nice features out of the box.

Comments

Thanks bro this is great explanation!