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I wrote an equivalent of what you've written, but instead of requests.get, I used urllib.request.openurl and didn't have the issue you're facing.

from flask import Flask, request
from six.moves import urllib

app = Flask(__name__)

@app.route('/background_process')
def background_process():

    try:
        address = request.args.get("textAddress") 
        resp = urllib.request.urlopen("http://"+address) 
        return resp.read() 
    except Exception as e:
        return(str(e))