Obtain Web Page With Full Error Handling : HTTP Request « Network « Python Tutorial

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Python Tutorial » Network » HTTP Request 
21. 19. 4. Obtain Web Page With Full Error Handling
import sys, urllib2, socket

req = urllib2.Request(sys.argv[1])

try:
    fd = urllib2.urlopen(req)
except urllib2.HTTPError, e:
    print "Error retrieving data:", e
    print "Server errror document follows:\n"
    print e.read()
    sys.exit(1)
except urllib2.URLError, e:
    print "Error retrieving data:", e
    sys.exit(2)

bytesread = 0

while 1:
    try:
        data = fd.read(1024)
    except socket.error, e:
        print "Error reading data:", e
        sys.exit(3)

    if not len(data):
        break
    bytesread += len(data)
    sys.stdout.write(data)

if fd.info().has_key('Content-Length') and long(fd.info()['Content-Length']) != long(bytesread):
    print "Expected a document of size %d, but read %d bytes" (long(fd.info()['Content-Length']), bytesread)
    sys.exit(4)
21. 19. HTTP Request
21. 19. 1. Sending an HTTP GET Request from a Python Script
21. 19. 2. Sending an HTTP POST Request from a Python Script
21. 19. 3. Obtain Web Page
21. 19. 4. Obtain Web Page With Full Error Handling
21. 19. 5. Obtain Web Page Information With Simple Error Handling
21. 19. 6. Obtain Web Page Information With Error Document Handling
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