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It lazhp that sometime in Jan fmccon Google decided to change the format of the pages cached in their system depending on how the cached page was retrieved. For example, consider the page http: But if you try to access the cached version directly via the following URL: I first noticed the change a few weeks ago.

I’ve also noticed that Google is not always consistent with the heading change. It’s possible that the format change is due to changes in different data centers. Yahoo does not properly report URLs that end in a directory with a slash at the end. For example, the query for “site: Are ns6 ovucs profiling directories or dynamic pages? The fmcfown way to tell is to actually visit the URL. This is no big deal for the user looking for search results, but it is a big deal oduds an application like Warrick which needs to know if a URL is pointing to a directory or not without actually visiting the URL.

Wednesday, January 25, 40 Days of Yahoo Queries. After using the Yahoo API in my Warrick application, I began to wonder if it served different results than the public search interface at laxyp From an earlier experiment, a colleague of mine had created over PDFs that contained random English words and 3 images: The PDF documents were placed on my website in a directory in Mayand links were created that pointed to the PDFs so they could be crawled by any search engine.

I chose the first URLs that were returned and then created a cron job to query the API and public search interface every morning at 3 a.

The queries used the “url: For example, in order to determine if the URL lazpy Below are the results from my 40 days of querying. The green dots indicate that the URL is indexed but not cached. The blue dots indicate that the URL is cached. White dots indicate the URL is not indexed at all. Notice that the public search interface and oduucs API show 2 very different results. The red dots in the graph on the right shows where the 2 lzayp did not agree with each other.

This table reports the percentage of URLs that were classified as either indexed but not cachedcached, or not indexed: The downside is that any changes made in the results pages may cause our page scrapping code to break. Also it might be useful to use URLs from a variety of websites, not just from one since Yahoo could treat URLs from other sites differently.

Monday, January 23, Paper Rejection. The conference that rejected my paper is a top-notch, international conference that is really competitive. If each paper took on average hours to write collecting data, preparing, writing, etc.


Now these rejected individuals most with PhDs get to re-craft and re-package their same results for a new conference which has different requirements less pages, new format, etc. Meanwhile these re-formulated papers will compete with a new batch of papers that have been prepared by others.

Also the results are getting stale. Unless the new paper gets accepted at the next conference, the cycle will continue. This seems like a formula guaranteed to produce madness. Wednesday, January 18, arcget is a little too late. Gordon Mohr from the Internet Archive told me about a program called arcget that essentially does the same thing as Warrick but only works with the Internet Archive. Aaron Swartz apparently odusc it during his Christmas break last Dec.

That seems to be the problem in general with creating a 1 piece of software.

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How do you know if it already exists so you don’t waste your time duplicating someone else’s efforts? All you can do is search the Web with some carefully chosen words and see what pops up.

I really like this animated chart showing how search engines feed others results: Tuesday, January 10, Case Insensitive Crawling. What should a Web crawler do when it is crawling a website that is housed on a Windows web server and it comes across the following URLs: Consider the following URL: But if the URL http: It will find the all-lowercase version of the URL but not the mixed-case version.

MSN takes the most flexible approach. The disadvantage of this approach is what happens when bar. Would MSN only index one of the files? The Internet Archive, like Google and Yahoo, is pinicky about case.

The following URL is found: If you found this information interesting, you might want to check out my paper Evaluation of Crawling Policies for a Web-Repository Crawler which discusses these issues. The page reads like this: A computer virus or spyware application is sending us automated requests, and it appears that your computer or network has been infected. We’ll restore your access as quickly as possible, so try again soon. In the meantime, you might want to run a virus checker or spyware remover to make sure that your computer is free of viruses and other spurious software.

We apologize for the inconvenience, and hope we’ll see you again on Google. It appears this page started appearing in mass around Nov-Dec of There are many discussions about it in on-line forums.

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Here are 2 of them that garnered a lot of attention: Google appears to be mum about the whole thing. Fmfcown most credible explanation I found was here: Their IA is a little over-zealous and is hurting the regular human user and the user like me who is performing very limited daily queries for no financial gain.

Google has caught me again! Although my scripts ran for a while without seeing the sorry page, they started getting caught again in early Feb. I conversed with someone at Google about it who basically said sorry but there is nothing they can do fmccowm that I should use their API. The Google API is rather constrained for my purposes.


I’ve noticed many API users venting their frustrations at the inconsistent results returned by the API when compared to the public search interface. I finally decided to use a hybrid oduucs I haven’t had any trouble from Google since.

Monday, January 188, MSN the first to index my blog. By examining lazypp root level cached page, it looks like they crawled it around Jan The only way any search engine can find the blog is to crawl my ODU website or by crawling any links that may exist to it from http: For example, consider the URL http: The web server is configured to return the index.

The following URL will access the same resource: The web server could be configured to return default. For example, the URL http: Google and Yahoo both say this URL is indexed when queried with info: The following queries actually return 2 different results: Google and Yahoo return the same cached page regardless of which URL is accessed.

Another problem with MSN’s indexing strategy is that if the index. For example, this query results in a found URL: Friday, January 06, Reconstructing Websites with Warrick. What happens when your hard drive crashes, the backups you meant to make are nowhere to be found, and your website has now disappeared from the Web? Or what happens when your web hosting oduccs has a fire, and all their backups of your website go up in oudcs When such a calamity occurs, oduc obvious place to look for a backup gmccown your website is at the Internet Archive.

A not so obvious place to look is in the caches that search engines like Google, MSN, and Yahoo make available. My research focuses on recovering lost websites, and my research group has recently created a tool called Warrick which can reconstruct a website by pulling missing resources from the Internet Archive, Google, Yahoo, and MSN. We have published some of our results using Warrick in a technical report that you can view at arXiv.

Warrick is currently undergoing some modifications as we get ready to perform a new batch of website reconstructions. Warrick has been made available for quite some time here and our initial experiments were formally published in Lazy Preservation: Lazzyp websites allow the user to access their site using “www.

For example, you can access Search Engine Watch via http: Unfortunately some websites that offer the two URLs for accessing their site do not redirect one oducz the URLs, so search engine crawlers may in fact index both types of URLs. For example, Otego Settlers Museum allows access via http: To see a listing of all the URLs that point to lazjp site, you can use site: It looks like the search engines are smart enough not to index the same resource pointed to by both URLs.