Connection to localhost:8000 server?

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By stubbsy345
:warning: Old Version Published before Godot 3 was released.

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 -
4
:bust_in_silhouette: Reply From: flesk

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.

Thanks bro this is great explanation!

stubbsy345 | 2017-10-03 21:29