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What is the email subject length limit?
... had a scan of The RFC for email but could not see specifically how long it was allowed to be.
I have a colleague that wants to programmatically validate for it.
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What are carriage return, linefeed, and form feed?
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Carriage return means to return to the beginning of the current line without advancing downward. The name comes from a printer's carriage, as monitors were rare when the name was coined. This is commonly escaped as \r, abbreviated CR, and has ASCII value 13 or 0x0D.
Linefeed means to advance...
Vagrant ssh authentication failure
The problem with ssh authentication:
29 Answers
29
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Get local IP address in node.js
...to get local IP address of PC on which my program is running. How do I get it with node.js?
38 Answers
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nginx server_name wildcard or catch-all
I have an instance of nginx running which serves several websites. The first is a status message on the server's IP address. The second is an admin console on admin.domain.com . These work great. Now I'd like all other domain requests to go to a single index.php - I have loads of domains and subd...
How to check the version of GitLab?
How to check which version of GitLab is installed on the server?
15 Answers
15
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Image comparison - fast algorithm
...an the first approach, and is straightforward to implement. However, what it gains in understandability, it lacks in robustness -- matching fails on scaled, rotated, or discolored images.
The third method is both fast and robust, but is potentially the hardest to implement.
Keypoint Matching
Bet...
Why Does OAuth v2 Have Both Access and Refresh Tokens?
... can return both an access_token (which is used to authenticate oneself with a resource) as well as a refresh_token , which is used purely to create a new access_token :
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String.replaceAll single backslashes with double backslashes
...is an escape character in both String and regex. You need to double-escape it for regex:
string.replaceAll("\\\\", "\\\\\\\\");
But you don't necessarily need regex for this, simply because you want an exact character-by-character replacement and you don't need patterns here. So String#replace() ...
Impossible to Install PG gem on my mac with Mavericks
I'm trying to install the pg gem in order to work again with my rails projects. But I get this error:
26 Answers
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