I wrote a simple pixel tracking program that works something like this
Step 1) tracker.com sets a cookie
Step 2) mysite.com displays <img src="tracker.com/tracking.php">. That image reads the cookie from Step 1 & does some processing.
Works great in Chrome, Firefox and Safari. But when tested in IE, the cookie can't be read in Step 2. It's as if the cookie doesn't exist -- but I know it does.
Any idea why IE pretends the cookie doesn't exist? I've tried messing with P3P headers, no luck.
Does your domain have a privacy policy? I forget what it's called, maybe p3p? Some random list of headers that you have to add.
Try adding the domain in the src attribute to trusted sites in IE. My guess is this is security, and you've got a rather arcane security measure you're coming up against.
If the cookie setting domain is 2 letters, I believe there is a bug within IE that prevents IE from doing cookies properly with 2 letter domains. If it isn't 2 letters, then nevermind.
It may be that IE is blocking 3rd-party cookies.
Its tricky without knowing more specifics of its use, but I'm trying at this late hour to figure out how to clone the cookie for the current domain using REMOTE_ADDR
So, the first answer was more about testing... try using JS to handle this -
From site-reference.com forums..
<script type='text/javascript'>
var track = new Image();
track.src="http://www.my-site.com/tracker.php?self=" + this.location;
</script>
*NOTE: Capital "I" in image, not lowercase!
Let us know! :D
Fred
Related
I'm creating a classifieds website in Django. A single view function handles global listings, city-wise listings, barter-only global listings and barter-only city-wise listings. This view is called ads.
The url patterns are written in the following order (note that each has a unique name although it's tied to the same ads view):
urlpatterns = patterns('',
url(r'^buy_and_sell/$', ads,name='classified_listing'),
url(r'^buy_and_sell/barter/$', ads,name='barter_classified_listing'),
url(r'^buy_and_sell/barter/(?P<city>[\w.#+-]+)/$', ads,name='city_barter_classified_listing'),
url(r'^buy_and_sell/(?P<city>[\w.#+-]+)/$', ads,name='city_classified_listing'),
)
The problem is that when I hit the url named classified_listing in the list above, the function ads gets called twice. I.e. here's what I see in my terminal:
[14/Jul/2017 14:31:08] "GET /buy_and_sell/ HTTP/1.1" 200 53758
[14/Jul/2017 14:31:08] "GET /buy_and_sell/None/ HTTP/1.1" 200 32882
This means double the processing. I thought urls.py returns the first url pattern matched. What am I doing wrong and what's the best way to fix this? All other calls work as expected btw (i.e. only once).
Note: Ask for more information in case I've missed something.
Great explanation to understand these type of occurences: https://groups.google.com/d/msg/django-users/CRMMYWix_60/KEIkguUcqxYJ
This issue has nothing to do with how url patterns are ordered in urls.py.
Like pointed out in the comments under the question, this has to do with problematic asset references in the HTML template.
What does that mean?
For instance, try curl -i http://localhost:8000/example/ >> output.txt in your terminal. Then open up output.txt in your editor of choice. Now search for href or src attributes where values are None (or otherwise malformed). That's one reason a double call is being created. That was the reason for me. I removed these, and the double call disappeared.
There's this old - but relevant - writeup about how to comprehensively diagnose this problem on your machine here: https://groups.google.com/forum/#!msg/django-users/CRMMYWix_60/KEIkguUcqxYJ
Happy testing.
As I can't comment on other answers, just to add for future wanderers that for me the "problem" was in a correctly formed but yet for the browser instructing <iframe src="#"..> tag. On django server the view was rendering twice, once with original request and then again by the hidden iframe element that I used for some of the modal popups later in the page usage.
After emptying the src attribute like <iframe src=""..> a second request is no longer initiated and my modals work fine.
The solution actually is from the link posted already in answers before [https://groups.google.com/forum/#!msg/django-users/CRMMYWix_60/KEIkguUcqxYJ][1]
where it is explained:
Note that it's a URI. That means something that is retrieved. Since
you've used the value "#fff", that will be interpreted by the browser as
a reference to the current page (#fff being an anchor, and not passed to
the server). Ergo, a second request is made.
that the iframe src # (anchor) is instructing the browser to load again the same URL, for the iframe element in my case.
I indeed had several style elements with #fff colors inside and whatnot, but this wasn't it, as browsers are smart enough to recognize this is not an anchor.
With available tools (browser only) I found to be easy to debug and find these initiation href/src attributes over the Network tab of your browser developer tools - in Chrome is just by clicking the Initiator link of the corresponding row - giving you the exact line from the page source that initiated the request to the same URL.
I struggled with the same problem and just wanted to share my experience with it. I had double requests all over my application but everything seemed to work as expected apart form it.
What Daniel Rossman pointet out in the comments was actually also true for my problem. I had a <link rel="shortcut icon" href="#"> in my base template which caused the double request, because of the #, which is a reference to the page itself. Once i removed it, i had no double requests anymore.
Hope this answer can save someone some debugging time.
I got double request in view function, in my scenario, this went wrong:
<img id="profile-img" src="#" alt="" class="profile-cover">
by setting src="" dismiss double request. it was a silly thing, I just thought it apply to a then must apply to img, but img actually send another request.
Thanks for everyone in advance.
I encountered a problem when using Scrapy on Python 2.7.
The webpage I tried to crawl is a discussion board for Chinese stock market.
When I tried to get the first number "42177" just under the banner of this page (the number you see on that webpage may not be the number you see in the picture shown here, because it represents the number of times this article has been read and is updated realtime...), I always get an empty content. I am aware that this might be the dynamic content issue, but yet don't have a clue how to crawl it properly.
The code I used is:
item["read"] = info.xpath("div[#id='zwmbti']/div[#id='zwmbtilr']/span[#class='tc1']/text()").extract()
I think the xpath is set correctly and I have checked the return value of this response and it indeed told me that there is nothing under this directory. Results shown here:'read': [u'<div id="zwmbtilr"></div>']
If it has something, there should be something between <div id="zwmbtilr"> and </div>.
Really appreciated if you guys share any thoughts on this!
I just opened your link in Firefox with NoScript enabled. There nothing inside the <div #id='zwmbtilr'></div>. If I enable the javascripts, I can see the content you want. So, as you already new, it is a dynamic content issue.
Your first option is try to identify the request generated by javascript. If you can do that, you can send the same request from scrapy. If you can't do it, the next option is usually to use some package with javascript/browser emulation or someting like that. Something like ScrapyJS or Scrapy + Selenium.
I'm panicking a little, so sorry if I haven't explained well enough.
I've dealt with quite the nightmare of a permalink restructuring experience
Old permalink= sitename/archives/postid
desired new= sitename/postname
tried everything it seems. I've even dabbled with /?p=$1 (<-----that nonsense!). But now i'm getting some crazy error when i go to my old permalink structure that reads:
Oops! Google Chrome could not connect to 0.0.37.89
Suggestions:
Try reloading: 0.0.37.89
and this was supposed to be "redirected".
I give up. please help.
sitename= brightontheday.com
I used the redirection plugin to redirect all old URL permalinks (/archives/postID) to the new permalink (/postID/postname)
also, the issue appeared to be due to cashing via cloudfare. It's important to to note that one should put cloudfare in "developer mode" while making site wide changes.
I have migrated my website from Joomla to RubyOnRails, but, I've noticed that number of likes has changed at the same URL!
It was about 780 in the old website, then it became 35 in the new one
What possible reasons it could be?
The most likely reason would be that the URLs are not exactly the same. Most likely due to a query string at the end of the URL.
If you are positive that isn't it, check to see that the source for calling the facebook like button is the same.
This is a long shot, but if it still isn't fixed, you might want to compare the meta data inside the head tag and look for differences there.
<link rel="canonical" href="http://my.website.com" />
would be one that comes to mind.
Is there a way to set a website like google.com as homepage through C++ or C ? How ?
Not sure what your motive is, but I don't think of this as something I want any code on my system to be setting out from under me. It sounds like the kind of thing adware/malware would do to your grandparents (who wouldn't know how to fix it once it's set). Note the negative comments when the question was asked of how to do it from JavaScript:
How can I set default homepage in FF and Chrome via javascript?
It's better to point people at instructions for doing it themselves. Remind with a banner which says "Make us your homepage!", and link to something along these lines:
http://www.makeuseof.com/tag/how-to-change-your-homepage-in-5-browsers/
If not for the aesthetic reasons, there are technical reasons not to try and write code for it. Each browser stores this information in its own place. In IE's case, there appears to be a registry setting:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Start Page
So you'd use calls to the Windows Registry API to query it and set it. But Firefox doesn't save this in the registry, it saves it in something called prefs.js and you'll be looking for:
user_pref("browser.startup.homepage", .... );
Then there's Opera, Safari, Chrome, etc. All told, better to just give people directions and put them in control of their experience!
Imports Microsft.Win32
...
Module Util
Sub SetHomePage(Dim theUrl As String)
Registry.SetValue("HKCU\Software\Microsoft\Internet Explorer\Main", "Start Page", theUrl)
End Sub
End Module
Yes.
Find the way each browser saves its configuration to disk and edit that (*). It may be a file, or records in a database, or some data in a central registry, or some other scheme --- the browser documentation should tell you.
To open/read/write/save/close a file, the C functions declared in the header <stdio.h> may be helpful.
(*) for Firefox it's a file named "prefs.ini" in a directory somewhere under the users home path; there may be more than 1 such file if the user has more than 1 profile.