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How does “304 Not Modified” work exactly?
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When the browser puts something in its cache, it also stores the Last-Modified or ETag header from the server.
The browser then sends a request with the If-Modified-Since or If-None-Match header, telling the server to send a 304 if the content still has that date...
How can I convert a file pointer ( FILE* fp ) to a file descriptor (int fd)?
I have a FILE * , returned by a call to fopen() . I need to get a file descriptor from it, to make calls like fsync(fd) on it. What's the function to get a file descriptor from a file pointer?
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How do I strip non alphanumeric characters from a string and keep spaces?
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In this case I would use the bang method (gsub! instead of gsub) in order to clean the input permanently.
#permanently filter all non-alphanumeric characters, except _
@search_query.gsub!(/\W/,'')
This avoids a situation where @s...
How can I alter a primary key constraint using SQL syntax?
...t wasn't clear, or anyone else makes the same mistake, the constraint name can't go in quotes alter table PatientsInfo drop constraint PK__Patients__1CBB51380A338187 is working here
– Maslow
Dec 9 '15 at 19:03
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How to copy directories in OS X 10.7.3?
... sourcedir being copied (instead of sourcedir as well), that's happening because you kept the trailing slash for sourcedir:
cp -R <sourcedir>/ <destdir>
The above only copies the files and their directories inside of sourcedir. Typically, you want to include the directory you're copyi...
What is the maximum characters for the NVARCHAR(MAX)?
... Just a nit pick. NVARCHAR uses 2 bytes for most characters. For unicode caracters over U+00FFFF. It'll use four bytes.
– Eli Algranti
Jul 28 '15 at 5:15
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How to make Sequelize use singular table names
I have an model called User but Sequelize looks for the table USERS whenever I am trying to save in the DB. Does anyone know how to set Sequelize to use singular table names? Thanks.
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Check if value already exists within list of dictionaries?
...ing for, otherwise False.
If the key could also be missing the above code can give you a KeyError. You can fix this by using get and providing a default value. If you don't provide a default value, None is returned.
if not any(d.get('main_color', default_value) == 'red' for d in a):
# does not ...
Git: updating remote branch information
...ng like
git branch -d -r remote_name/branch_name
you only remove your local checkout. This command doesn't do anything to the remote repository, which is why it still shows up.
Solution:
git push origin :branch_name
will remove the the remote branch (note the ':'), and
git branch -d branch_...
Xcode 4 - “Archive” is greyed out?
I would like to archive my application, but the Archive option is greyed out. What could cause this?
4 Answers
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