Rasa: Simple Rasa Core + NLU Rest API delivering responses

[jenniferzhu]

My goal is to wrap the rasa core + nlu bot into an API so that I can call it in some JavaScript-based UI, such as a simple angularjs-chat ( http://angularjs.chat/tutorials/angularjs-basic-chat-module/).

However, I can only use CustomInput to send a message to "localhost:5005" by POST but I cannot get the response from my bot. Is there any way that I could build/modify on top of the rasa_core? I know that it is already using Flask, so I don’t want to build another Flask app on top of that.

In summary, I guess it would be great if we can set up an API such as "localhost:5005" to receive the questions from users and send responses back to the same channel, like what we have using the consoleInput.

[tmbo]

You can create a custom input channel like this:

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import logging

from flask import Blueprint, request, jsonify

from rasa_core.channels.channel import UserMessage
from rasa_core.channels.direct import CollectingOutputChannel
from rasa_core.channels.rest import HttpInputComponent

logger = logging.getLogger(__name__)


class SimpleWebBot(HttpInputComponent):
    """A simple web bot that listens on a url and responds."""

    def blueprint(self, on_new_message):
        custom_webhook = Blueprint('custom_webhook', __name__)

        @custom_webhook.route("/", methods=['GET'])
        def health():
            return jsonify({"status": "ok"})

        @custom_webhook.route("/webhook", methods=['POST'])
        def receive():
            payload = request.json
            sender_id = payload.get("sender", None)
            text = payload.get("message", None)
            out = CollectingOutputChannel()
            on_new_message(UserMessage(text, out, sender_id))
            responses = [m for _, m in out.messages]
            return jsonify(responses)

        return custom_webhook

A request to /webhook will give a json response like ["How are you?"] with the messages of the bot.

[schafferer]

Hey, @tmbo, i tried this approach, and it just returns an empty list as response. The bot works just fine from the command line. I see the response gets stored in the tracker object, but there is no messages in out.messages.

[sachin-srijan]

hey @tmbo same here, there is no proper documentation how to use that custom channel.

[pradeepmvn]

There is a validation error when I execute this custom channel

python -m rasa_core.run -d models/dialogue -u models/nlu/current --port 5002 --connector SimpleWebBot

usage: run.py [-h] -d CORE [-u NLU] [-p PORT] [-o LOG_FILE]
              [--credentials CREDENTIALS]
              [-c {facebook,slack,telegram,cmdline}] [--debug] [-v]
run.py: error: argument -c/--connector: invalid choice: 'rasa-ui-channel.SimpleWebBot' (choose from 'facebook', 'slack', 'telegram', 'cmdline')

This could be cleared by commenting out parser argument choices in run.py

choices=["facebook", "slack", "telegram", "cmdline"],

@tmbo can this be updated to accept custom channels?

[pradeepmvn]

Also to get this working, domain.yml should not have Remote action factory declaration.

action_factory: remote

[TabrejTeli]

choices=["facebook", "slack", "telegram", "cmdline"],

Hi @pradeepmvn after commenting above line as you said, i am still getting the following error

Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/home/user/Desktop/rasa_chatbot/rasa-core-fr/rasa_core/rasa_core/run.py", line 151, in <module>
    cmdline_args.credentials)
  File "/home/user/Desktop/rasa_chatbot/rasa-core-fr/rasa_core/rasa_core/run.py", line 134, in main
    input_channel = create_input_channel(channel, port, credentials_file)
  File "/home/user/Desktop/rasa_chatbot/rasa-core-fr/rasa_core/rasa_core/run.py", line 119, in create_input_channel
    raise Exception("Unknown input channel for running main.")
Exception: Unknown input channel for running main.

please help.

[dtfiedler]

After you've trainined rasa-NLU and rasa-core, create a file called 'serve.py' in your projects root directory with the following code. then run python serve.py run

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import logging

from rasa_core.channels import HttpInputChannel
from rasa_core import utils
from rasa_core.agent import Agent
from rasa_core.interpreter import RasaNLUInterpreter
from rasa_core.channels.channel import UserMessage
from rasa_core.channels.direct import CollectingOutputChannel
from rasa_core.channels.rest import HttpInputComponent
from flask import Blueprint, request, jsonify

logger = logging.getLogger(__name__)
class SimpleWebBot(HttpInputComponent):
    """A simple web bot that listens on a url and responds."""

    def blueprint(self, on_new_message):
        custom_webhook = Blueprint('custom_webhook', __name__)

        @custom_webhook.route("/status", methods=['GET'])
        def health():
            return jsonify({"status": "ok"})

        @custom_webhook.route("/", methods=['POST'])
        def receive():
            payload = request.json
            sender_id = payload.get("sender", None)
            text = payload.get("message", None)
            out = CollectingOutputChannel()
            on_new_message(UserMessage(text, out, sender_id))
            responses = [m for _, m in out.messages]
            return jsonify(responses)

        return custom_webhook

def run(serve_forever=True):
    #path to your NLU model
    interpreter = RasaNLUInterpreter("models/nlu/default/current")
    # path to your dialogues models
    agent = Agent.load("models/dialogue", interpreter=interpreter)
    #http api endpoint for responses
    input_channel = SimpleWebBot()
    if serve_forever:
        agent.handle_channel(HttpInputChannel(5004, "/chat", input_channel))
    return agent

then you should be able to POST a request to the following endpoint:

localhost:5004/chat/

using a body like:

{ "sender": "default", "message": "hello"}

[TabrejTeli]

hey @dtfiedler it worked thank you so much for your help :+1:

[tmbo]

I think adding an endpoint like this to the server.py could actually work quite well for this use case, what do you think @dtfiedler ?

[alokraj68]

@dtfiedler the code just executes and exists!

[TabrejTeli]

@alokraj68 call the run() at the end

if __name__ == '__main__':
    utils.configure_colored_logging(loglevel="INFO")
    run()

[Selvaganapathi06]

how to add cross origin the above mentioned serve.py?

[Selvaganapathi06]

i have used above code and customize UI but faced below error in UI

Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin

[amn41]

flask cors is what you want

[Selvaganapathi06]

i have already installed flask cors and added the below line of code
from flask import Flask
from flask_cors import CORS

app = Flask(__name__)
CORS(app)

i tried some different way also. It's working fine postman, only issue in my ui integration.

can you please tell me which place need to add cross origin code, I have used above mentioned serve.py. Please help on this ASAP. Any other way available using customize channel ? please suggest me.

[Selvaganapathi06]

Thanks, Above mentioned cross origin issue was fixed.

[arunimaChaurasia]

@Selvaganapathi06
can you please tell me how your issue was solved?

[Selvaganapathi06]

Please check the below example

! /usr/bin/env python

from flask import Flask
from flask_cors import CORS, cross_origin
from SimpleHTTPServer import SimpleHTTPRequestHandler, test
app = Flask(__name__)
class CORSHTTPRequestHandler(SimpleHTTPRequestHandler):
def end_headers(self):
self.send_header('Access-Control-Allow-Origin', '*')
super(CORSHTTPRequestHandler, self).end_headers(self)
@app.route("/")
@cross_origin()
def hello():
return "Hello World!"
if __name__ == '__main__':
app.run(host='0.0.0.0', debug=True)

[arunimaChaurasia]

@Selvaganapathi06

Same error again!
could not solve with this example

[Selvaganapathi06]

Can you please tell me what is your issue exactly

[arunimaChaurasia]

The thing is I am trying to create a channel that handles request for bot
as well as handle other queries also like user login etc
Is it possible ?
Coz this code gives custom app and I am new to this , so cannot understand
how it will actually work !?

On Wed, Mar 28, 2018, 2:43 PM Selvaganapathi06 [e-mail]
wrote:

Can you please tell me what is your issue exactly

—
You are receiving this because you commented.
Reply to this email directly, view it on GitHub
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.

[Selvaganapathi06]

yes , it is working with request and response

[arunimaChaurasia]

I am so sorry but can you please elaborate ?

On Wed, Mar 28, 2018, 2:57 PM Selvaganapathi06 [e-mail]
wrote:

yes , it is working with request and response

—
You are receiving this because you commented.
Reply to this email directly, view it on GitHub
https://github.com/RasaHQ/rasa_core/issues/119#issuecomment-376821583,
or mute the thread
https://github.com/notifications/unsubscribe-auth/AUBCaZSKLyNm6a9oEqEdZ9iEosIlYJnsks5ti1d0gaJpZM4QsV9D
.

[diegoami]

For me it works replacing

responses = [m for _, m in out.messages]

with

responses = [m["text"] for m in out.messages]

[NikhilBansal21]

@dtfiedler hi i am trying doing the mentioned steps but commands does not works it loads and nothing happens

[diegoami]

Well, if use @dtfiedler's code and you need CORS it seems that you need to directly modify rasa_core/channels/rest.py code in a cloned repository to make it work - change the method HttpInputChanell._record_message in the following way, and add import to CORS :

 def _record_messages(self, on_message):
        # type: (Callable[[UserMessage], None]) -> None
        from flask import Flask

        app = Flask(__name__)
        CORS(app)
        app.config['CORS_HEADERS'] = 'Content-Type'

[diegoami]

As nobody is pointing out here, this is actually a better way you are supposed to do it now (I think you still need the latest version cloned from master). :

Start the server with CORS support, eg :
python -m rasa_core.server -d models/dialogue -u models/nlu/default/current --debug -o out.log --cors *

and then call the new API "respond"

curl -XPOST localhost:5005/conversations/default/respond -d '{"query":"Hello"}'

You should get the answer from your engine:

[{"recipient_id": "default", "text": "Hello there. I am fine, and my family is also fine."}]%

It is also now documented at https://github.com/RasaHQ/rasa_core/blob/master/docs/http.rst

It is also important to make sure that you do not send any headers from your cross-site request, otherwise it will not work.

[amn41]

@diegoami https://github.com/RasaHQ/rasa_core/pull/383 should fix the issue with CORS

[diegoami]

Wow that was a quick fix !

[akelad]

closing this for now, let us know if there's more issues

[nileshgarg]

I follow the above steps and logs are not generating...

[NewtoAI]

Hi I used the same serve.py(attached) as suggested by @dtfiedler
serve.zip

I use the below to craft my message from the client terminal when the above serve.py is running on the server terminal port 5004

curl -XPOST localhost:5004/chat/ -d '{"sender":"default", "message": "hello"}'

However, I get the below error;

[2018-05-11 17:02:10,286] ERROR in app: Exception on /chat/ [POST]
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "serve.py", line 31, in receive
    sender_id = payload.get("sender", None)
AttributeError: 'NoneType' object has no attribute 'get'
127.0.0.1 - - [2018-05-11 17:02:10] "POST /chat/ HTTP/1.1" 500 412 0.068356

Can someone please help me ?

Thanks in advance

---

I am also not able get a response as stated by @diegoami above:

I run the server as mentioned, it starts listening, then I run the client with the above command and I get the below message:

the server:

2018-05-11 17:52:43+0530 [-] "127.0.0.1" - - [11/May/2018:12:22:42 +0000] "POST /conversations/default/respond HTTP/1.1" 404 233 "-" "curl/7.47.0"

the client:

# curl -XPOST localhost:5005/conversations/default/respond -d '{"query":"Hello"}'

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>404 Not Found</title>
<h1>Not Found</h1>
<p>The requested URL was not found on the server.  If you entered the URL manually please check your spelling and try again.</p>

[nahidalam]

Worked using @diegoami method from command line

Following @dtfiedler approach (w/o any modification to the Rasa core) doesn't work. Using Rasa core version 0.9.0a6 and Rasa NLU version 0.12.3 I am getting below error

On the server side -

ERROR    flask.app - Exception on /chat/ [POST]
 File "serve.py", line 31, in receive
    sender_id = payload.get("sender", None)
AttributeError: 'NoneType' object has no attribute 'get'

On the client side

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>500 Internal Server Error</title>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error and was unable to complete your request.  Either the server is overloaded or there is an error in the application.</p>

[tmbo]

Make sure to set the curl json header (-H "Content-Type: application/json")

[nahidalam]

@tmbo not sure what you meant. I run serve.py and then used below command in a different terminal

curl -H "Content-Type: application/json" -XPOST localhost:5004/chat/ -d '{"sender":"default", "message": "hello"}'

I am getting reply ["text"] which is wrong. I am supposed to get something like 'hi, How can I help?'

[tmbo]

try replacing the line
responses = [m for _, m in out.messages]
with
responses = [m.get("text") for _, m in out.messages]

[nahidalam]

@tmbo just did it. Now I am getting error again running serve.py

On the client

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>500 Internal Server Error</title>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error and was unable to complete your request.  Either the server is overloaded or there is an error in the application.</p>

On the server

File "serve.py", line 35, in receive
    responses = [m.get("text") for _, m in out.messages]
  File "serve.py", line 35, in <listcomp>
    responses = [m.get("text") for _, m in out.messages]
AttributeError: 'str' object has no attribute 'get'
127.0.0.1 - - [2018-05-22 12:46:35] "POST /chat/ HTTP/1.1" 500 412 0.016356

[nitinkumartech]

@nahidalam Did you figure out this problem? Because we are also stuck with this..

[nahidalam]

@nitincypher I solved it in a different way.

1st run below command in a terminal
$python -m rasa_core.server -d <DIALOGUE_MODEL_PATH> -u <NLU_MODEL_PATH> --debug -o out.log --cors *

Then run below code

import requests
import json

data = '{"query":"hello"}'
response = requests.post('http://localhost:5005/conversations/default/respond', data=data)
json_response = response.json()
print (json_response[0]['text'])

This should output the reply of hello in your terminal.

[nitinkumartech]

@nahidalam Thank you. We finally figured it out :)

[gprabhuv4me]

Using the above code, i am getting the responses but how can i host this in server.

$python -m rasa_core.server -d -u --debug -o out.log --cors *

import requests
import json

data = '{"query":"hello"}'
response = requests.post('http://localhost:5005/conversations/default/respond', data=data)
json_response = response.json()
print (json_response[0]['text'])

[akelad]

i'm not sure what your question is - could you elaborate please?

[chinnusujitha]

How can i display buttons that are defined in my yaml file using rest api. or is there any way to return the response through rest api in this format:
{
type : "text",
message : "how can i help you"
}

{
type : "buttons",
message : "we are providing options for : ",
options : ["option1", "option2" ]
}

[akelad]

please create a new issue for this

[krati5]

@dtfiedler i ran the script python serve.py run from command line and then switched to chrome and entered http://localhost:5000/chat in the search bar but it shows "Method Not Allowed.The method is not allowed for the requested URL." . what am i doing wrong?

[kappaganthusivaram]

@diegoami,

When we are using this below code, where are we specifying that port number is 5005 for this. Also could you plese explain what is the need of having server up and running through this command and also through code given by @tfiedler
As nobody is pointing out here, this is actually a better way you are supposed to do it now (I think you still need the latest version cloned from master). :

Start the server with CORS support, eg :
python -m rasa_core.server -d models/dialogue -u models/nlu/default/current --debug -o out.log --cors *

and then call the new API "respond"

curl -XPOST localhost:5005/conversations/default/respond -d '{"query":"Hello"}'

You should get the answer from your engine:

[{"recipient_id": "default", "text": "Hello there. I am fine, and my family is also fine."}]%

It is also now documented at https://github.com/RasaHQ/rasa_core/blob/master/docs/http.rst

It is also important to make sure that you do not send any headers from your cross-site request, otherwise it will not work.

[Bhaarat-Pachori]

After you've trainined rasa-NLU and rasa-core, create a file called 'serve.py' in your projects root directory with the following code. then run python serve.py run

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import logging

from rasa_core.channels import HttpInputChannel
from rasa_core import utils
from rasa_core.agent import Agent
from rasa_core.interpreter import RasaNLUInterpreter
from rasa_core.channels.channel import UserMessage
from rasa_core.channels.direct import CollectingOutputChannel
from rasa_core.channels.rest import HttpInputComponent
from flask import Blueprint, request, jsonify

logger = logging.getLogger(__name__)
class SimpleWebBot(HttpInputComponent):
    """A simple web bot that listens on a url and responds."""

    def blueprint(self, on_new_message):
        custom_webhook = Blueprint('custom_webhook', __name__)

        @custom_webhook.route("/status", methods=['GET'])
        def health():
            return jsonify({"status": "ok"})

        @custom_webhook.route("/", methods=['POST'])
        def receive():
            payload = request.json
            sender_id = payload.get("sender", None)
            text = payload.get("message", None)
            out = CollectingOutputChannel()
            on_new_message(UserMessage(text, out, sender_id))
            responses = [m for _, m in out.messages]
            return jsonify(responses)

        return custom_webhook

def run(serve_forever=True):
    #path to your NLU model
    interpreter = RasaNLUInterpreter("models/nlu/default/current")
    # path to your dialogues models
    agent = Agent.load("models/dialogue", interpreter=interpreter)
    #http api endpoint for responses
    input_channel = SimpleWebBot()
    if serve_forever:
        agent.handle_channel(HttpInputChannel(5004, "/chat", input_channel))
    return agent

then you should be able to POST a request to the following endpoint:

localhost:5004/chat/

using a body like:

{ "sender": "default", "message": "hello"}

When I try this code, I get import errors I fixed most of them by following the migration guide here I just can't fix HttpInputChannel error

from rasa_core.channels import HttpInputChannel (In serve.py)
ImportError: cannot import name 'HttpInputChannel'
I am using starter-pack-rasa-stack
Before, trying this I wrote my own flask wrapper to chat with the bot, I am aware it's not needed I can directly use this serve.py. Please, help how to sort this out and get the GUI working. Please, follow this detailed query I posted on the community
here

If I do a POST request in the below format I get 500 Error:

response = requests.post('http://localhost:5002/webhooks/rest/webhook', data=payload)
I run the rasa_core server as:
python -m rasa_core.server -d models/rasbot/dialogue -u models/rasbot/nlu --port 5002 --debug --cors *

If I do a POST request in the below format I get 404 Error:

response = requests.post('http://localhost:5002/conversations/default/respond', data=payload)
I run the rasa_core as:
python -m rasa_core.run --enable_api --endpoints endpoints.yml -d models/rasbot/dialogue -u models/rasbot/nlu --port 5002 --debug
Any help is appreciated.
Thanks

[Bhaarat-Pachori]

@diegoami,

When we are using this below code, where are we specifying that port number is 5005 for this. Also could you plese explain what is the need of having server up and running through this command and also through code given by @tfiedler
As nobody is pointing out here, this is actually a better way you are supposed to do it now (I think you still need the latest version cloned from master). :

Start the server with CORS support, eg :
python -m rasa_core.server -d models/dialogue -u models/nlu/default/current --debug -o out.log --cors *

and then call the new API "respond"

curl -XPOST localhost:5005/conversations/default/respond -d '{"query":"Hello"}'

You should get the answer from your engine:

[{"recipient_id": "default", "text": "Hello there. I am fine, and my family is also fine."}]%

It is also now documented at https://github.com/RasaHQ/rasa_core/blob/master/docs/http.rst

It is also important to make sure that you do not send any headers from your cross-site request, otherwise it will not work.

There is no file named http.rst as mentioned in the URL. I checked the repository and there is no such file

[akelad]

Please create a new issue

[savi429]

Solution provided by @dtfiedler was nice but what was the version of rasa nlu and rasa core
when im using with Rasa nlu -- 0.13.4 Rasa_core -- 0.11.1 this version facing problem with importings even i tried this migrating guide too https://rasa.com/docs/core/migrations/ but still facing problem with importings

[Pras-commits]

Hi im facing the similar issue...
Here is my server.py file..

`import logging
from rasa_core.agent import Agent
from rasa_core.interpreter import RasaNLUInterpreter
from rasa_core.channels.channel import CollectingOutputChannel
from flask import json
from klein import Klein
from pymongo import MongoClient
from pymongo import DESCENDING
import datetime
import urllib3
http=urllib3.PoolManager()
import json
import requests
import time
import calendar
from ast import literal_eval

logger = logging.getLogger(__name__)
db = client.convai

def request_parameters(request):
if request.method.decode('utf-8', 'strict') == 'GET':
return {
key.decode('utf-8', 'strict'): value[0].decode('utf-8','strict')
for key, value in request.args.items()}
else:
content = request.content.read()
try:
return json.loads(content.decode('utf-8', 'strict'))
except ValueError as e:
logger.error("Failed to decode json during respond request. Error: {}. Request content: '{}' ".format(e, content))
raise

class Server:
app = Klein()

def __init__(self, model_directory, interpreter):
    self.model_directory = model_directory
    self.interpreter = interpreter
    self.agent = self._create_agent(model_directory, interpreter)

@staticmethod
def _create_agent(model_directory, interpreter):
    """Creates a Rasa Agent which runs when the server is started"""
    try:
        return Agent.load(model_directory, interpreter)
    except Exception as e:
        logger.warn("Failed to load any agent model. Running Rasa Core server with out loaded model now. {}".format(e))
        return None

@app.route("/api/v1/status", methods=['GET'])
def status(self, request):
    """Check if the server is running and responds with the status."""
    request.setHeader('Access-Control-Allow-Origin', '*')
    return json.dumps({'status': 'OK'})



@app.route('/api/v1/<sender_id>/parse', methods=['GET', 'POST'])
def parse(self, request, sender_id):
    request.setHeader('Content-Type', 'application/json')
    request_params = request_parameters(request)

    if 'query' in request_params:
        message = request_params.pop('query')
    elif 'q' in request_params:
        message = request_params.pop('q')
    else:
        request.setResponseCode(400)
        return json.dumps({"error": "Invalid parse parameter specified"})
    try:
        response = self.agent.start_message_handling(message, sender_id)
        request.setResponseCode(200)
        return json.dumps(response)
    except Exception as e:
        request.setResponseCode(500)
        logger.error("Caught an exception during parse: {}".format(e), exc_info=1)
        return json.dumps({"error": "{}".format(e)})

@app.route('/api/v1/<sender_id>/respond', methods=['GET', 'POST'])
def respond(self, request, sender_id):
    request.setHeader('Content-Type', 'application/json')
    request.setHeader('Access-Control-Allow-Origin', '*')

    request_params = request_parameters(request)
    print("=========Request PARam================: ",request_params)
    if 'query' in request_params:
        message = request_params.pop('query')
    elif 'q' in request_params:
        message = request_params.pop('q')
    else:
        request.setResponseCode(400)
        return json.dumps({"error": "Invalid parse parameter specified"})
    try:
        out = CollectingOutputChannel()
        response = self.agent.handle_message(message, output_channel=out, sender_id=sender_id)
        request.setResponseCode(200)
        return json.dumps(response)
    except Exception as e:
        request.setResponseCode(500)
        logger.error("Caught an exception during parse: {}".format(e), exc_info=1)
        return json.dumps({"error": "{}".format(e)})

if __name__ == "__main__":
server = Server("models/dialogue", RasaNLUInterpreter("./models/nlu/default/weathernlu"))
server.app.run("0.0.0.0", 8087)`

Im currently using Klein as an API wrapper and able to run RASA Core in my terminal.Im not able to get a response from the bot

Im not able to get the response for the API which worked perfectly fine with version 7 of RASA. After the upgrade of RASA from 7 to 12 it was not working. Im not able to understand why the code for 2nd API is not working.I have made necessary changes for migrating from version 7 to version 12 ..Requesting your help…

[Pras-commits]

@dtfiedler, @tmbo , @schafferer , @TabrejTeli
Ive tried this approach, and it just returns an empty list as response. The bot works just fine from the command line. I see the response gets stored in the tracker object..But im getting empty response when im trying to hit it through postman..
Can someone help me out with this..
Here is my error_screenshot in postman:

[liangjun-jiang]

@PrasannaGaneshu , try the Body with query property,

{
    "query":"12-12-2019"
}

[pradeepd80]

Hi All ,
Could you please help me any one I am facing issue on chatbot conversation . My UI in angular and Now i want to access rasa core + nlu as rest from my angular services.

my python complete code as follows:
I am new in python and rasa:

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import logging

import requests

from rasa_core.utils import EndpointConfig

from rasa_core.channels import HttpInputChannel
from rasa_core import utils
from rasa_core.agent import Agent
from rasa_core.interpreter import RasaNLUInterpreter
from rasa_core.channels.channel import UserMessage
from rasa_core.channels.direct import CollectingOutputChannel
from rasa_core.channels.rest import HttpInputComponent
from flask import Blueprint, request, Flask # jsonify,
from flask_cors import CORS, cross_origin
from flask_restful import Resource, Api
from json import dumps
from flask_jsonpify import jsonify

app = Flask(__name__)
api = Api(app)

CORS(app)

logger = logging.getLogger(__name__)

class SimpleWebBot(HttpInputChannel):
"""A simple web bot that listens on a url and responds. """
def blueprint(self, on_new_message):
custom_webhook = Blueprint('custom_webhook', __name__)

    @custom_webhook.route("/status", methods=['GET'])
    def health():   
        print(f"1***********{request}**********************")
        return jsonify({"status":"ok pradeep find out status by localhost:5004/chat/status Service"})

    @custom_webhook.route("/", methods=['POST'])        
    def receive():
        print(f"2***********{request}**********************")
        payload = request.json
        print(f"3***********************{payload}************************")
        sender_id = payload.get("sender", None)
        text = payload.get("message", None)
        out = CollectingOutputChannel()
        print("11***********************************{out}*********************************")
        on_new_message(UserMessage(text, out, sender_id))
        responses = [m for _, m in out.messages]            
        return jsonify(responses)

    return custom_webhook

def run(serve_forever=True):
interpreter = RasaNLUInterpreter("./models/nlu/default/weathernlu")
agent = Agent.load("./models/dialogue", interpreter=interpreter)
input_channel = SimpleWebBot(5004, "/chat")
if serve_forever:
print("6run******SERVER STARTED**************")
agent.handle_channel(HttpInputChannel(5004, "/chat",input_channel))
return agent

if __name__ == '__main__':
utils.configure_colored_logging(loglevel="INFO")
run()

Please be response I stucked.
Thanks Adv.

[pradeepd80]

I am facing mainly two issue

1. In postman is ok. but when I am calling "http://127.0.0.1:5004/chat/status" from angular then showing error:
   Access to XMLHttpRequest at 'http://127.0.0.1:5004/chat/status' from origin 'http://localhost:4200' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

1. When i am calling http://127.0.0.1:5004/chat from postman there is showing server error.

Please help.
Thanks in Adv.