Google Cloud Function HTTP Trigger - flask

Question

I am trying to give arguments to my function by adding URL parameter.
import json
import flask
def location_sort(request):
request_json = request.get_json()
location = json.dumps(request_json)
location = json.loads(location)
reverse_location = {v: k for k, v in location.items()}
x = location.keys()
harf_x = (float(max(x)) + float(min(x))) / 2
y_right = []
y_left = []
sorted_location = []
for i in location:
if float(i) < harf_x:
y_left.append(location[i])
else:
y_right.append(location[i])
y_left.sort()
y_right.sort(reverse=True)
sorted_input = y_left + y_right
for i in sorted_input:
sorted_location.append([reverse_location[i], i])
for i in sorted_location:
i[0],i[1] = float(i[0]),float(i[1])
return sorted_location
def cal_centroid(location):
area = 0 # 면적
centroid_x = 0
centroid_y = 0
temp = 0
for i in range(len(location)):
if i == len(location)-1:
temp = location[i][0]*location[0][1] - location[0][0]*location[i][1]
area += temp*0.5
centroid_x += (location[i][0] + location[0][0]) * temp
centroid_y += (location[i][1] + location[0][1]) * temp
else:
temp = location[i][0]*location[i+1][1] - location[i+1][0]*location[i][1]
area += temp*0.5
centroid_x += (location[i][0] + location[i+1][0]) * temp
centroid_y += (location[i][1] + location[i+1][1]) * temp
centroid_x = round(centroid_x / (6*area), 6)
centroid_y = round(centroid_y / (6*area), 6)
x = [centroid_x, centroid_y]
return json.dumps(x)
def main(request):
request_args = request.args
if request_args and "location" in request_args:
request = request["location"]
request = json.dumps(request)
a = location_sort(request)
return cal_centroid(a)
This is my code for Cloud Function and i run main function. And i tried the URL as
https://<REGION>-<GOOGLE_CLOUD_PROJECT>.cloudfunctions.net/FUNCTION_NAME?location={"37.284213":"127.006481","37.562045":"127.034809","37.528694":"126.907483","37.411124":"127.124356"}
And it returns
Error: could not handle the request
What could be the problem to my code? I am very beginner for GCF and i would be very thankful for your help:)