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I am seeing this error in server.py file, " The browser (or proxy) sent a request that this server could not understand."

Here I am attaching my server.py and util.py
I have trained a model, and now wish to print the data on user's demand.
server.py
from flask import Flask, request, jsonify
#from waitress import serve
import util
import json
#%run util.ipynb
app = Flask(__name__)
#app.route('/hi')
def hi():
return util.areas()
#app.route('/locations')
def locations():
response = jsonify({
'locations': util.locations()
})
response.headers.add('Access-Control-Allow-Origin', '*')
return response
#app.route('/predict_home_price', methods=['GET', 'POST'])
def predict_home_price():
total_sqft = float(request.form['total_sqft'])
location = request.form['location']
size = int(request.form['size'])
bath = int(request.form['bath'])
area_type = request.form['area_type']
balcony = int(request.form['balcony'])
response = jsonify({
'estimated_price': util.get_estimated_price(area_type, location, size, total_sqft, bath, balcony)
})
response.headers.add('Access-Control-Allow-Origin', '*')
return response
if __name__ == '__main__':
print('python flask started')
app.run()
#serve(app, host='0.0.0.0', port=50100, threads=1)
util.py
import json
import joblib
import numpy as np
__locations = None
__area = None
__model = None
def get_estimated_price(area_type, location, size, total_sqft, bath, balcony):
x = np.zeros(6)
x[0] = __area.index(area_type)
x[1] = __locations.index(location)
x[2] = size
x[3] = total_sqft
x[4] = bath
x[5] = balcony
return round(__model.predict([x])[0][0],2)
def locations():
return __locations
def areas():
return __area
def load_saved_artifacts():
print("loading saved artifacts...start")
global __data_columns
global __locations
global __area
with open('./artifacts/locations.json','r') as f:
__locations = json.load(f)['data_locations']
with open('./artifacts/area.json','r') as f:
__area = json.load(f)['data_area']
global __model
__model = joblib.load('./artifacts/Banglore_Real_State_Price')
print(" loading artifacts is done")
if __name__ == '__main__':
load_saved_artifacts()
#print(locations())
#print(areas())
print(get_estimated_price('Super built-up Area','Electronic City Phase II',2,1056,2,1))
print(get_estimated_price('Built-up Area','Uttarahalli',3,1440,2,3))
print(get_estimated_price('Super built-up Area','Lingadheeranahalli',3,1521,3,1))
print(get_estimated_price('Super built-up Area','Kothanur',2,1200,2,1))
Immediate help is really appreciated
I have trained a model, and now wish to print the data on user's demand.
I am seeing this error in server.py file, " The browser (or proxy) sent a request that this server could not understand." I checked everything works fine if I am sending data to browser but not when asking for the data, I tried Postman for sending the data.
http://127.0.0.1:5000/predict_home_price -> shows bad request.
http://127.0.0.1:5000/locations -> shows correct data
http://127.0.0.1:5000/hi -> shows correct data

As you mentioned, when you're sending data to the server it works, and that's because you're using a POST request and the request has form data in it.
But when you're "asking for data", you're probably using a GET request, which has no form data in it, and that's why the server responses with an error.
You can modify your code so you can decide what you should do for each type of request:
#app.route('/predict_home_price', methods=['GET', 'POST'])
def predict_home_price():
if request.method == "POST":
# get form data and do something with it
elif request.method == "GET":
# return some value, without looking for form data

Variable doesn't keep it's values when using it in different py file - Python (Flask)

import vars
from flask import Flask, render_template, request
app = Flask(__name__)
#app.route('/')
def index():
return render_template('index.html')
def stuff(insta_username, insta_password, hashtag, caption):
vars.insta_username = insta_username
vars.insta_password = insta_password
vars.hashtag = hashtag
vars.caption = caption
print(f"name {vars.insta_username}")
print(f"pass {vars.insta_password}")
print(f"ahsh {vars.hashtag}")
print(f"cap {vars.caption}")
#app.route('/', methods=['GET','POST'])
def getvalue():
stuff(request.form['username'], request.form['password'], request.form['hashtag'], request.form['caption'])
# idk(request.form['username'], request.form['password'], request.form['hashtag'], request.form['caption'])
return render_template('pass.html', n=vars.insta_username, p=vars.insta_password, h=vars.hashtag, c=vars.caption)
if __name__ == '__main__':
vars.init()
app.run(debug=True)
I am trying to assess data that I put in a HTML form to python variables. I used flask for this. The issue is that the variables here get filled by the HTML Form but they go back empty when they are used in the main.py file below.
from vars import *
import vars
import random
from time import sleep
from instagrapi import Client
client = Client()
class StartupRoutine:
def __init__(self, welcome, insta_username, insta_password, hashtag, caption, pause):
self.welcome = welcome
self.insta_username = insta_username
self.insta_password = insta_password
self.hashtag = hashtag
self.caption = caption
self.pause = pause
print(f"username {vars.insta_username}")
print(f"password {vars.insta_password}")
print(f"hashtag {vars.hashtag}")
print(f"caption {vars.caption}")
startUp = StartupRoutine(print("Instagrapi), vars.insta_username, vars.insta_password, vars.hashtag, vars.caption, random.randrange(3, 5))
startUp.welcome
print("Starting bot")
print("Attempting login")
boolLoggedin = client.login(startUp.insta_username, startUp.insta_password, True)
print("Successfully logged in")
This is the main.py file where I try to assign variables from vars.py in the startup routine.
def init():
global insta_username
global insta_password
global hashtag
global caption
insta_username = ""
insta_password = ""
hashtag = ""
caption = ""
This is the vars file which gets imported in main.py for use but just has empty values
I am trying to fill the empty variables in vars.py with the data i insert in the HTML forms. I can see they get filled in the server.py file but as soon as the vars.py file gets imported in the main/py file the variables go back to empty.
I think the issue is in server.py where the variables are in a function.
P.S. I'm sorry for a very messy post. This is my first time using stack overflow and I'm only a junior at college.
Thanks for the help.

Issue with bad request syntax with flask

I am testing/attempting to learn flask, and flast_restful. This issue I get is:
code 400, message Bad request syntax ('name=testitem')
main.py:
from flask import Flask,request
from flask_restful import Api, Resource, reqparse
app = Flask(__name__)
api = Api(app)
product_put_args = reqparse.RequestParser()
product_put_args.add_argument("name", type = str, help = "Name of the product")
product_put_args.add_argument("quantity", type = int, help = "Quantity of the item")
products = {}
class Product(Resource):
def get(self, barcode):
return products[barcode]
def put(self, barcode):
args = product_put_args.parse_args()
return {barcode: args}
api.add_resource(Product, "/product/<int:barcode>")
if(__name__) == "__main__":
app.run(debug = True)
and my
test.py
import requests
base = "http://127.0.0.1:5000/"
response = requests.put(base + "product/1", {"name": "testitem"})
print(response.json())
I have attempted to reform mat and change around both files to figure out what is sending the issue, I feel like it is something simple, but if you can help me, I bet this will help me and many others that are trying to start creating a rest API.

You need to add the location information to the RequestParser by default it tries to parse values from flask.Request.values, and flask.Request.json, but in your case, the values need to be parsed from a flask.request.form. Below code fixes your error
from flask import Flask,request
from flask_restful import Api, Resource, reqparse
app = Flask(__name__)
api = Api(app)
product_put_args = reqparse.RequestParser()
product_put_args.add_argument("name", type = str, help = "Name of the product", location='form')
product_put_args.add_argument("quantity", type = int, help = "Quantity of the item", location='form')
products = {}
class Product(Resource):
def get(self, barcode):
return products[barcode]
def put(self, barcode):
args = product_put_args.parse_args()
products[barcode] = args['name']
return {barcode: args}
api.add_resource(Product, "/product/<int:barcode>")
if(__name__) == "__main__":
app.run(debug = True)

Add cache-control to my python app in Flask

I am doing a few tests about my website.
My app was developped using flask,
I want to add cach-control "max-age=3600" in my function below :
from flask import Flask, jsonify, abort
from waitress import serve
import pandas as pd
from time import time as t
from load_data.connexion_to_blob import connexion_to_blob
from load_data.load_recos import load_recos
# CONFIG FILE
import configparser
config = configparser.ConfigParser()
config.read('config.ini')
# CHARGE DATA FROM BLOB
mode = 'blob'
blob_service_client = connexion_to_blob("AZURE_STORAGE_CONNECTION_STRING")
load_recos(blob_service_client, langue='fr', mode='blob')
# LOAD DATA IN APP
recos_fr_file = config['PATH']['recos_fr_file']
recos_fr = pd.read_pickle(recos_fr_file)
recos_dict = {'fr': recos_fr}
app = Flask(__name__)
#app.route('/<langue>/<program_id>/<top>')
def get_reco(langue, program_id, top=10):
t_all = t()
top = int(top)
if program_id not in list(recos_dict[langue].keys()):
abort(404, description="programId not found")
else:
recos_list = recos_dict[langue][program_id][:top]
json_output = {
"data": [
{"programId": programId}
for programId in recos_list
]
}
print("temps exec total: ", (t() - t_all))
print('---------------------------------')
return jsonify(json_output)
if __name__ == '__main__':
serve(app, host='X.X.X.X', port=XX, threads=8)
I already check some documentation,
My question is at what level should this be done?
Thank you.

We can add cach control using :
#app.after_request
def apply_caching(response):
response.headers['Cache-Control'] = 'public, max-age=3600,stale-while-revalidate=600, stale-if-error=259200'
return response

How can I resolve these flask 500 server errors? [duplicate]

This question already has an answer here:
Why not generate the secret key every time Flask starts?
(1 answer)
Closed 4 years ago.
I'm currently super stumped. I have a large flask application that I recently deployed to my production ec2 server that's not functioning properly. It works fine in dev/test. It looks like, maybe, apache is hanging. When I first deployed it, it worked a few times. Then, after that I started getting 500 server errors. When I restart apache, it works fine again for a session but the 500 server errors come back. Each time, on a different page of the application. This is reoccurring. How would I go about fixing this? Here's my routes/app.py:
from flask import Flask, render_template,redirect,request,url_for, flash, session
from Index_generator import index_generator
from Yelp_api import request_yelp
from plaid import auth
from search_results import search,search1
from Options import return_data
from datetime import timedelta
import os
import urllib2
import time
from path import path_data
#from writer import create_config_file
import logging
from logging_path import log_dir
logger = logging.getLogger("Routing")
logger.setLevel(logging.INFO)
foodie_log = log_dir()
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - % (message)s')
foodie_log.setFormatter(formatter)
logger.addHandler(foodie_log)
app = Flask(__name__)
app.secret_key = os.urandom(24)
go = path_data()
#app.before_request
def make_session_permanent():
session.permanent = False
app.permanent_session_lifetime = timedelta(seconds=300)
##app.route('/setup',methods=['GET','POST'])
#def setup():
# if request.method == 'POST':
# Username=request.form['username']
# Password=request.form['password']
# Port=request.form['port']
# Host=request.form['host']
# C_Key=request.form['CONSUMER_KEY']
# C_Sec=request.form['CONSUMER_SECRET']
# Tok=request.form['TOKEN']
# Tok_Sec=request.form['TOKEN_SECRET']
# clientid=request.form['client_id']
# Sec=request.form['secret']
# create_config_file(Username,Password,Port,Host,C_Key,C_Sec,Tok,Tok_Sec,clientid,Sec)
# return 'complete'
# elif request.method == 'GET':
#
# return render_template('setup.html')
#app.route('/')
def home():
store = index_generator()
session['store'] = store
return render_template('home.html')
#app.route('/about')
def about():
return render_template('about.html')
#app.route('/home_city',methods = ['POST'])
def home_city():
try:
CITY=request.form['city']
store = session.get('store')
request_yelp(DEFAULT_LOCATION=CITY,data_store=store)
return render_template('bank.html')
except Exception as e:
logger.error(e)
error = 'Sorry, no results. Is' + ' ' +CITY + ' '+ 'your hometown? If not, try again and if so, we have been made aware of the issue and is working to resolve it'
return render_template('home.html',error=error)
#app.route('/traveling',methods = ['POST'])
def travel():
store = session.get('store')
answer=request.form['Travel']
if answer == 'yes':
#time.sleep(2)
return render_template('destination.html')
else:
results_home = search(index=store)
time.sleep(2)
return return_data(results_home)
#app.route('/dest_city',methods = ['POST'])
def dest_city():
store = session.get('store')
try:
DESTINATION=request.form['dest_city']
request_yelp(DEFAULT_LOCATION=DESTINATION, data_store=store,sourcetype='dest_city')
results_dest = search1(index=store)
time.sleep(2)
return return_data(results_dest)
except urllib2.HTTPError:
error = 'Sorry, no results. Is your destination city? If not, try again and if so, we have been made aware of the issue and is working to resolve it'
return render_template('destination.html',error=error)
#app.route('/bank',methods = ['POST'])
def bank():
try:
store = session.get('store')
print store
Bank=request.form['Fin_Bank']
Username=request.form['username']
Password=request.form['password']
Test = auth(account=Bank,username=Username,password=Password,data_store=store)
if Test == 402 or Test ==401:
error = 'Invalid credentials'
return render_template('bank.html',error=error)
else :
return render_template('travel.html')
except:
logger.error(e)
if __name__ == '__main__':
app.run(debug=True)
app.secret_key=os.urandom(24)

Not completely sure if this causes your errors but you should definitely change this:
You have to set app.secret_key to a static value rather than os.urandom(24), e.g.:
app.secret_key = "/\xfa-\x84\xfeW\xc3\xda\x11%/\x0c\xa0\xbaY\xa3\x89\x93$\xf5\x92\x9eW}"
With your current code, each worker thread of your application will have a different secret key, which can result in errors or session inconsistency depending on how you use the session object in your application.