Headers and Basic Authentication
You can configure custom headers and basic auth for your Netlify site by adding a
_headers file to the root of your site folder.
The format is very simple. You can specify one or several URL paths with their additional headers:
## A path: /templates/index.html # Headers for that path: X-Frame-Options: DENY X-XSS-Protection: 1; mode=block /templates/index2.html X-Frame-Options: SAMEORIGIN
Paths can contain
:placeholder matches anything except
/ while a
* matches anything.
Here’s an example of settings the
X-XSS-Protection headers for all pages on your site:
/* X-Frame-Options: DENY X-XSS-Protection: 1; mode=block
If your team is using a paid plan, the headers file can also be used to set basic authentication headers. It’s a simple way to limit access to particular parts of your site.
/something/* Basic-Auth: someuser:somepassword anotheruser:anotherpassword
This will trigger the built-in basic browser authentication for any URL under
/something. There’s two users defined here, one with the username “someuser” and password “somepassword”, the other with “anotheruser” and “anotherpassword”.
Unlike other headers in the
_headers file, the
Basic-Auth header will obviously not be sent as a standard HTTP header but used to control the appropriate HTTP headers for basic authentication.
Basic-Auth is only available if you’re on a Silver plan or higher.
Multi-key header rules
_headers file can include multiple headers with the same name. In that case, Netlify, will concatenate the values of those headers into a single header as described in the RCF 7230.
For example, you can include several Link header fields in the file, like this:
/* Link: </style.css>; rel=preload; as=stylesheet Link: </main.js>; rel=preload; as=script Link: </image.jpg>; rel=preload; as=image
And they will be collapsed into one header following the HTTP 1.1 specification:
Link: </style.css>; rel=preload; as=stylesheet, </main.js>; rel=preload; as=script, </image.jpg>; rel=preload; as=image
Testing header rules
You can test if the rules in your
_headers file are correct at Netlify’s Playground. Copy your rules there and click
Test rules. The playground will list all the invalid rules in your file if there is any.
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