>The Origin request header indicates where a fetch originates from. It doesn't include any path information, but only the server name. It is sent with CORS requests, as well as with POST requests. It is similar to the Referer header, but, unlike this header, it doesn't disclose the whole path.
From https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Origin
Working code samples
```php
<?php
// We'll be granting access to only the arunranga.com domain
// which we think is safe to access this resource as application/xml
if($_SERVER['HTTP_ORIGIN'] == "http://arunranga.com") {
header('Access-Control-Allow-Origin: http://arunranga.com');
header('Content-type: application/xml');
readfile('arunerDotNetResource.xml');
} else {
header('Content-Type: text/html');
echo "<html>";
echo "<head>";
echo " <title>Another Resource</title>";
echo "</head>";
echo "<body>",
"<p>This resource behaves two-fold:";
echo "<ul>",
"<li>If accessed from <code>http://arunranga.com</code> it returns an XML document</li>";
echo "<li>If accessed from any other origin including from simply typing in the URL into the browser's address bar,";
echo "you get this HTML document</li>",
"</ul>",
"</body>",
"</html>";
}
?>
```
See https://developer.mozilla.org/en-US/docs/Web/HTTP/Server-Side_Access_Control for more info.
close#13835
Implement retrieving DBMS constraints
* db-constraints2: (21 commits)
CHANGELOG for #14105
added missing abstract methods to ConstraintFinderTrait
avoid dependency of SqlTokenizer on sqlite implementation
Mention an usage magic in descriptions
Fix an unknown variable usage bug
updated phpdoc
make schema cache version a constant
Have I fixed these phpdocs? Let’s see…
Fixed phpdoc [skip ci]
Mark not supported constraint retrieving methods
Add PHPDoc
Fix typo [skip ci]
Rename DefaultConstraint to DefaultValueConstraint
Fix imports
Fix merging issues & CS
Add Command tests
Fix constraint tests
Disable column comment test on old CUBRID
Fix dropping unique/indexes
Fix schema caching on commands
...
Carsten Brandt
Alexander Makarov
yyxx9988
Jitendra Joshi
Robert Korulczyk
girmate
Alex
Sergey Makinen
Konstantin Tsukur
Andrew Nester
Anton Anisimov
Sam
Elvira Sheina
Daniel Gómez Pan
Pavel Chaplygin
DaveFerger
dhoomm