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What's an appropriate HTTP status code to return by a REST API service for a validation failure?
...I is supposed to have an ISO-8601 date and you find that it's in the wrong format or refers to February 31st, then you would return an HTTP 400. Ditto if you expect well-formed XML in an entity body and it fails to parse.
(1/2016): Over the last five years WebDAV's more specific HTTP 422 (Unproces...
Why does C++ require a user-provided default constructor to default-construct a const object?
...9), the default constructor for T is called (and the initialization is ill-formed if T has no accessible default constructor);
It simply talks about default constructor of T, whether its user-defined or compiler-generated is irrelevant.
If you're clear up to this, then understand what the spec ne...
The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or
... x[[i]]
x[[i, j]]
x$a
x$"a"
For vectors and matrices the [[ forms are rarely used, although they have some slight semantic differences from the [ form (e.g. it drops any names or dimnames attribute, and that partial matching is used for character indices). When indexing multi-dimensio...
Differences between contentType and dataType in jQuery ajax function
...
From the documentation:
contentType (default: 'application/x-www-form-urlencoded; charset=UTF-8')
Type: String
When sending data to the server, use this content type. Default is "application/x-www-form-urlencoded; charset=UTF-8", which is fine for most cases. If you explicitly pass in a co...
Saving and Reading Bitmaps/Images from Internal memory in Android
... image to the OutputStream
bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fos);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace(...
Commenting in a Bash script inside a multiline command
...need to be before the \ continuation.
Note that parameter expansion is performed inside the comment:
$ ls file
ls: cannot access 'file': No such file or directory
$ echo foo${IFS# This command will create file: $(touch file)}bar
foo bar
$ ls file
file
Rare exception
The only rare case this fail...
Spring MVC: How to perform validation?
I would like to know what is the cleanest and best way to perform form validation of user inputs. I have seen some developers implement org.springframework.validation.Validator . A question about that: I saw it validates a class. Does the class have to be filled manually with the values from the us...
Import / Export database with SQL Server Server Management Studio
...te" from the context menu.
Make sure "Delete backup and restore history information for databases" check-box is checked.
Select "OK" to complete the deletion process.
Repeat the above steps for the "wtMaster" part of the database.
Right click on "Databases" and select "Restore Database..." from the...
Is there a difference between copy initialization and direct initialization?
...tion
While they look identical and are supposed to do the same, these two forms are remarkably different in certain cases. The two forms of initialization are direct and copy initialization:
T t(x);
T t = x;
There is behavior we can attribute to each of them:
Direct initialization behaves like...
Anyone else find naming classes and methods one of the most difficult parts in programming? [closed]
...classes, I scrutinize the function to see if its basic function is to transform one kind of thing into another kind of thing. I'm using that term very loosely, but you'll discover that a HUGE number of functions that you write essentially take something in one form and produce something in another f...