473,701 Members | 2,385 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

how to force HTTP 1.1 when using urllib2?

When I request a URL using urllib2, it appears that urllib2 always
makes the request using HTTP 1.0, and not HTTP 1.1. I'm trying to use
the "If-None-Match"/"ETag" HTTP headers to conserve bandwidth, but if
I'm not mistaken, these are HTTP 1.1 headers, so I can't reasonably
expect a web server to respond correctly to my requests. (In my
limited testing, it looks like some servers respond correctly with an
HTTP 304 status, while some respond with an HTTP 200 and a full
response body.)

My specific issue notwithstanding , is there any way to force HTTP 1.1
to be used? Or am I doing something wrong?

I've condensed my code into the following example, which produces
similar results on two different setups, Python 2.3.2 on Windows and
Python 2.2.1 on Debian Linux. With this particular URL, the server
responds to my HTTP 1.0 request with an HTTP 1.1 response and an HTTP
304 status code, which suits my purposes, but I'd feel more comfortable
if my outgoing response also declared itself to be an HTTP 1.1 request.
Example code:

import httplib
httplib.HTTPCon nection.debugle vel = 1
import urllib2

url = 'http://www.mozilla.org/images/firefox-oneoh-top.png'
etag = '"788054-2d18-3b21a80"'

request = urllib2.Request (url)
request.add_hea der('If-None-Match', etag)
opener = urllib2.build_o pener()
response = opener.open(req uest)
Example output:

connect: (www.mozilla.org, 80)
send: 'GET /images/firefox-oneoh-top.png HTTP/1.0\r\nHost:
www.mozilla.org\r\nUser-agent: Python-urllib/2.0a1\r\nIf-none-match:
"788054-2d18-3b21a80"\r\n\r\ n'
reply: 'HTTP/1.1 304 Not Modified\r\n'
header: Date: Tue, 21 Dec 2004 21:56:27 GMT
header: Server: Apache/2.0.46 (Red Hat)
header: Connection: close
header: ETag: "788054-2d18-3b21a80"
Traceback (most recent call last):
File "urllib2-test.py", line 11, in ?
response = opener.open(req uest)
File "D:\Python\lib\ urllib2.py", line 333, in open
'_open', req)
File "D:\Python\lib\ urllib2.py", line 313, in _call_chain
result = func(*args)
File "D:\Python\lib\ urllib2.py", line 849, in http_open
return self.do_open(ht tplib.HTTP, req)
File "D:\Python\lib\ urllib2.py", line 843, in do_open
return self.parent.err or('http', req, fp, code, msg, hdrs)
File "D:\Python\lib\ urllib2.py", line 359, in error
return self._call_chai n(*args)
File "D:\Python\lib\ urllib2.py", line 313, in _call_chain
result = func(*args)
File "D:\Python\lib\ urllib2.py", line 419, in http_error_defa ult
raise HTTPError(req.g et_full_url(), code, msg, hdrs, fp)
urllib2.HTTPErr or: HTTP Error 304: Not Modified

Jul 18 '05 #1
0 2646

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: Matthew Wilson | last post by:
I am writing a script to check on my router's external IP address. My ISP refreshes my IP very often and I use dyndns for the hostname for my computer. My Netgear mr814 router has a webserver that uses HTTP basic authorization. My script uses urllib2 to connect to the router and read the html page with the current external IP address. This is the function I wrote to lookup the router's external IP: def mr814(router_user,...
by: OvErboRed | last post by:
Hi, I'm trying to determine whether a given URL exists. I'm new to Python but I think that urllib is the tool for the job. However, if I give it a non-existent file, it simply returns the 404 page. Aside from grepping this for '404', is there a better way to do this? (Preferrably, there is a solution that can be applied to both HTTP and FTP.) Thanks in advance.
by: Michael Foord | last post by:
#!/usr/bin/python -u # 15-09-04 # v1.0.0 # auth_example.py # A simple script manually demonstrating basic authentication. # Copyright Michael Foord # Free to use, modify and relicense. # No warranty express or implied for the accuracy, fitness to purpose
by: John Reese | last post by:
Hello there. I've run into some missing functionality with HTTP Digest authentication in the 2.3 library and I was wondering if I'm just missing something. Missing functionality the first: urllib2 1a. You can add "handlers" to your opener indicating that you want to use HTTP Digest auth. This is nice way to handle it, but I don't see any way to use a custom verb in your URLOpener -- it always uses either GET or POST depending on...
by: john | last post by:
I'm trying to access the XML version of my Tivo now playing list with python. It uses auth digest HTTP authentication. I could really use some help! I'm able to get this page using curl: curl --dump-header tivoHeaders --insecure --anyauth --user tivo:8000008 "" But
by: Alimah | last post by:
My objective is to log onto a wiki account (specifically wikipedia) using the http proxies provided by them ( - The operating system is Windows XP/Windows Server 2003. Or more conveniently, what do I need to change in the standard python library so that all python>>internet interaction would be done through a proxy? (I'm guessing urlib2.py?) I have a program login.py (full script:...
by: Baptiste Lepilleur | last post by:
I activated httplib debug, and when trace are printed, a UnicodeError exception is thrown. I have already set sys.stdout to use utf-8 encoding (this removed the exception when *I* was printing unicode), but from the stacktrace below, the encoding seems to magically have switched to 'ascii' when httplib does the printing... import codecs import sys sys.stdout = codecs.getwriter("utf-8")(sys.__stdout__) ....
by: Astan Chee | last post by:
Hi, Im trying to implement the logic from http://www.hypothetic.org/docs/msn/general/http_connections.php to a simple python code using urllib2 and some parts of urllib. Im behind a http proxy that requires authentication that is why Im using urllib2. Im asking for help on how to send commands in a body of a HTTP before requesting for response. What am I doing wrong? I only get the response from the server but my commands never seem to be...
by: silk.odyssey | last post by:
I am getting the following error trying to download an html page using urllib2. urllib2.HTTPError: HTTP Error 204: NoContent The url is of this type: http://www.amazon.com/gp/offer-listing/B000KJX3A0%3FSubscriptionId%3D183VXJS74KNQ89D0NRR2%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D386001%26creativeASIN%3DB000KJX3A0 I can open it in my browser without problems.Any ideas on a solution?
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.