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In what cases will HTTP_REFERER be empty

I know it's possible to get an empty HTTP_REFERER. Under what circumstances does this happen? If I get an empty one, does it always mean that the user changed it? Is getting an empty one the same as getting a null one? and under what circumstances do I get that too? ...
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Insert line break inside placeholder attribute of a textarea?

I have tried a few approaches but none worked. Does anyone know a the nifty trick to get around this? 21 Answers ...
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Network tools that simulate slow network connection [closed]

... I was already a lover of Fiddler but now I just can't live without it. I didn't know that the tool I need lives with me every day :) – Ignacio Soler Garcia May 29 '12 at 19:20 ...
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Is GridFS fast and reliable enough for production?

...ours...). We do not have this problem any more with gridfs, our images are now stored in big mongodb chunks (2gb files) So... on my mind... Yes, gridfs is fast and reliable enough to be used for production. share |...
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conditional unique constraint

... way to pass the values being inserted or updated to the function, do you know how to ? – np-hard May 14 '09 at 22:11 ...
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Redis key naming conventions?

...key is obvious: toy/234 This is the unique key for the toy. The key can now be used also on client side: { key: "toy/234", color: "red", url: function () { return API_BASE_URL + this.key; } } An user requests an object with key toy/666. How to get it from Redis? A Node....
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Changing specific text's color using NSMutableAttributedString in Swift

...the title question: To change the colour of a length of text you need to know the start and end index of the coloured-to-be characters in the string e.g. var main_string = "Hello World" var string_to_color = "World" var range = (main_string as NSString).rangeOfString(string_to_color) Then you c...
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Sort an Array by keys based on another Array?

...d I thought to myself, this is extremely efficient compared to the loops. Now I have a need for your solution and it took me an hour of searching to find it again! Thanks! – Michael Nov 13 '17 at 3:29 ...
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Prevent a webpage from navigating away using JavaScript

... Thanks @Flimm, I've updated the answer so it is now accurate for current browsers. – Jimmie R. Houts Dec 3 '19 at 22:30 ...
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Selenium WebDriver: Wait for complex page with JavaScript to load

...t every single one of them has a problem: As Ashwin Prabhu said, if you know the script well, you can observe its behaviour and track some of its variables on window or document etc. This solution, however, is not for everyone and can be used only by you and only on a limited set of pages. Your so...