Exception: Connection to server failed at xx

Hi,
I admit, I am a newbie… but I simply try to reproduce the example for a simple server response:

form:

from ._anvil_designer import Form1Template
from anvil import *
import anvil.server

class Form1(Form1Template):

  def __init__(self, **properties):
    # Set Form properties and Data Bindings.
    self.init_components(**properties)

    # Any code you write here will run when the form opens.

  def button_1_click(self, **event_args):
    """This method is called when the button is clicked"""
    result = anvil.server.call('say_hello', 'hello developer')
    print(result)

server side:

import anvil.server

# This is a server module. It runs on the Anvil server,
# rather than in the user's browser.
#
# To allow anvil.server.call() to call functions here, we mark
# them with @anvil.server.callable.
# Here is an example - you can replace it with your own:
#
@anvil.server.callable
def say_hello(name):
  print("Hello, " + name + "!")
  return 42

I keep getting: " Exception: Connection to server failed at [Form1, line 15]"

Probably I made a stupid mistake. However, any kind help is very welcome!

Vinz

Edit:
Clone Link: https://anvil.works/build#clone:FVRHWGJIWEFDLPCD=MQMN5CGYSP2RXI5UEFLBHQ2P

Summary

Edit2:
The frustrating truth: our firewall/proxy blocks the request from the client side to the server side. The application would work…

EDIT 3:
A further update: It turns out finally that the proxy was only part of the problem. Second part of the problem is Firefox as a Browser. There was a problem with a setting in Firefox (to be found in about:config):


The setting was set to True in my browser. Once set to False, the problem with the app disappeared. I am using FF 68.9.0esr as a browser. Google SPDY seems to have a problem with my version of Firefox. Funnily the app works with Chrome (however, I experienced other problems regarding Anvil and our Proxy). According to our network team the problem is a combination of the proxy and SPDY protocol implementation in our version of Firefox. Thanks for all answers.

Welcome to Anvil!

Please can you share a clone link so i can check it out? Here’s how to do that :

https://anvil.works/docs/editor/cloning

1 Like

Hi David.

I have edited the link.

https://anvil.works/build#clone:FVRHWGJIWEFDLPCD=MQMN5CGYSP2RXI5UEFLBHQ2P

@frvi2 Just popping in here to say that I have tried the link and it seems to work properly on my end. Are you still getting an error?

Oh, oops, I did not realize the edits on the original post that describe a firewall issue:

Works fine for me, no errors at all.

Ah - I missed those too :slight_smile:

Hi, thanks for your answer! I have solved the problem. Please see edit. Vinz

Hi David

Please refer to my latest edit. It seems, that the problem is solved. Thanks for your answer.

vinz

1 Like