HTTP 错误 403：禁止

告诉我如何处理错误？我知道服务器并不想响应我的请求，只是阻止了我。如何绕过它？我正在尝试保存来自 NASA 网站的照片。理论上，一切都应该有效，因为这是 Microsoft DEV330x 课程中的一项任务，它适用于所有人。但看起来美国宇航局已经厌倦了这些要求，他们对学生采取了某种保护措施。

%%writefile apod.py

import argparse
from datetime import date, timedelta
from random import randint
import os
import urllib.request

def parse_command_line():

    parser = argparse.ArgumentParser()
    parser.add_argument("-d",'--date', nargs = 3, metavar = ("month", "day", "year"), action = "store", type = int, help = "month day year formatted date (i.e. 03 28 1998)")
    parser.add_argument ('-s', '--surprise', action = 'store_true', help = 'select a random date for a surprise image')
    parser.add_argument ('-k', '--api_key', action = "store", type = str, help = 'NASA developer key')
    parser.add_argument ('-v', '--verbose', action = 'store_true', help = 'verbose mode')
    args = parser.parse_args()
    return args

def create_date(datelist, surprise):

try:    
    if datelist != None:
        d = date(datelist[2], datelist[0], datelist[1])
        return d
    else:
        if surprise:
            start_date = date(1995,6,16)
            end_date = date.today()
            delta = end_date - start_date
            delta_random = randint(0, delta.days)
            d = date.today() - timedelta(delta_random)
            return d

        else: 
            end_date = date.today()
            d = date.today() - timedelta(days = 1) 
            return d

except :
    return None

def query_url(d, api_key):
    global date_obj
date_obj = d.strftime("%Y-%m-%d")
URL = "https://api.nasa.gov/planetary/apod?api_key={}&date={}"
complete_URL = URL.format(api_key,date_obj)
return complete_URL


def save_image(d, image):


year = d.strftime("%Y")
month = d.strftime("%m")
file_path = year+"/"+month+"/"+date_obj+".jpg"
open(file_path, 'wb')
return file_path



def request(url):


# request the content of url and save the retrieved binary data
with urllib.request.urlopen(url) as response:
    data = response.read()

# convert data from byte to string
data = data.decode('UTF-8')

# convert data from string to dictionary
data = eval(data)
return data

def download_image(url):

# request the content of url and return the retrieved binary image data
with urllib.request.urlopen(url) as response:
    image = response.read()
return image

def main():
# NASA developer key (You can hardcode yours for higher request rate limits!)
API_KEY = "cZX0zRDveiz7AfGfOW23typMH3NCnS3uvQJc0ZNS"

# parse command line arguments
args = parse_command_line()

# update API_KEY if passed on the command line
print(args.api_key)
if args.api_key != '':
    API_KEY = args.api_key

# create a request date
d = create_date(args.date, args.surprise)

# ascertain a valid date was created, otherwise exit program
if d is None:
    print("No valid date selected!")
    exit()

# verbose mode
if args.verbose:
    print("Image date: {}".format(d.strftime("%b %d, %Y")))

# generate query url
url = query_url(d, API_KEY)

# verbose mode    
if args.verbose:
    print("Query URL: {}".format(url))

# download the image metadata as a Python dictionary
metadata = request(url)

# verbose mode    
if args.verbose:
    # display image title, other metadata can be shown here
    print("Image title: {}".format(metadata['title']))

# get the url of the image data from the dictionary
image_url = metadata['url']

# verbose mode    
if args.verbose:
    print("Downloading image from:", image_url)

# download the image itself (the returned info is binary)
image = download_image(image_url)

# save the downloaded image into disk in (year/month)
# the year and month directories correspond to the date of the image (d)
# the file name is the date (d) + '.jpg'
save_image(d, image)

print("Image saved")

if __name__ == '__main__':
main()