Upload file using flask rest api python

Question

I have been using the following script to upload file. This script upload the excel file and will save it in the local folder.

from flask import Flask
import werkzeug
werkzeug.cached_property = werkzeug.utils.cached_property 
from werkzeug.utils import secure_filename
from flask_restplus import reqparse
from flask_restplus import Api, Resource
import os
from indivumed_data import *
import pandas as pd
import time



file_upload = reqparse.RequestParser()
file_upload.add_argument('input_file',
                         type=werkzeug.datastructures.FileStorage,
                         location='files',
                         required=True,
                         help='Input file (xls) containing the clinical data')
file_upload.add_argument('dictionary_file',
                         type=werkzeug.datastructures.FileStorage,
                         location='files',
                         required=True,
                         help='dictionary file (csv) containing the column values')

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

app.config['Upload_folder'] = './input/'


@api.route('/upload/')
class my_file_upload(Resource):
    @api.expect(file_upload)
    def post(self):
        if not os.path.exists('./input/'):
            os.makedirs('./input/')
        args = file_upload.parse_args()
        args['input_file'].save(os.path.join(app.config['Upload_folder'],secure_filename(args['input_file'].filename)))
        args['dictionary_file'].save(os.path.join(app.config['Upload_folder'],secure_filename(args['dictionary_file'].filename)))
        a = [args['input_file'],args['dictionary_file']]
        time.sleep(5)
        print(type(a))
        # input file
        reader = pd.ExcelFile(r"./input/Clinical_data.xls")

        # dict file
        d = pd.read_csv(r"./input/dict_data.csv")
        db_rows = d.Provider.unique()

        op=final_data(reader, d, db_rows)
        return op

if __name__ == '__main__':
    app.run(debug=True)

This script runs perfectly if I run it locally. I was trying to run it in GitLab, when I opened the link http://127.0.0.1:5000/ I get This site has been reached error. How do I run this page without an error?