Facebook url leading to 404 page - html

In my website, I have link to a facebook page search result (https://www.facebook.com/page/104839442303062/search/?q=Moong%20sprout). While testing on my end, this link works well, but while viewing on other device or incognito window, it leads to 404 page.
Does this happen because the user hasn't logged in facebook? If so, what can I do to make it the page visible for everyone?

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Safari address bar shows a blank page with "data:," after posting a form

When I post a form to my rails website (using turbolinks, not sure if it is relevant) from safari on mac, instead of redirecting to the next page, it just shows a blank page, with "data:," in the address bar.
I have an embedded youtube video on the page, in case that is relevant. Also, my form has a textarea that uses ckeditor.
The record is saved, just that it does not redirect to the show page as I would expect.
This does not happen on chrome.
The page source for the blank page shows up as:
<html> = $0<head></head><body></body></html>

Facebook page tab app is not visible for a person authorized as an page owner

I have FB page with a tab where an application is located.
The visitors are seeing it properly.
And I can see it to, but just before I authorized as a page owner. Right after that I see an empty tab with no iframe loaded. I checked a page code, a there is no iframe at all.
How to do it visible? Any ideas?
Thanks in advance.

Page disappears from cache after first redirect on chrome

I am trying to divert the user to an offline page when he comes to my site and the device is currently offline.
The problem is I trigger the caching from the home page itself so the problem is when the user comes to my url he comes to the loading page itself and not the offline page I would like him to go to.
What I do is using js redirect the user if the manifest is not available
function errorCache(event) {
//Redirect for error event of manifest
var offlineURL = 'http://myUrl/OfflinePage'
window.location = offlineURL;
}
window.applicationCache.addEventListener("error", errorCache, false);
Now this works perfectly the first time the user goes to the page. The next time I go to the homepage though, it redirects me to the offline page, but the offline page is not available anymore.
Any idea if this is a chrome issue or a HTML5 behavior and how can I retain the offline page?
thanks

Why doesn't the favicon icon show in Firebug Net Panel

I have seen this on a lots of websites e-g: Even here:
http://www.w3.org/2005/10/howto-favicon
When you load all the resources for this page under Net Panel in firebug and check the images tab, it shows all the images on the page but the favicon doesnt show up. Why?
Should I be looking for it somewhere else in firebug.
The first answer to this thread, by Jan Odvarko (who is a contributor to Firebug), seems to explain why the favicon is not displayed in Firebug's net tab (quoting):
The problem is that the network request for favicon isn't associated
with the page where the icon is displayed. So, Firebug (i.e. Net
panel) don't know that it belongs to the page and skips the request

Google Analytics Shows Top Hits on a Page That Doesn't Exist

We have a redirect on our website at /pages/home.php which 301 redirects to the home page (home.php). Google Analytics, for whatever reason shows /pages/home.php as the top landing page, even though there is no such page.
I was under the impression that Google Analytics did not record redirects but only the final landing pages.
What am I doing wrong?