What is ETag header?

What is ETag header?

An ETag (entity tag) is an HTTP header that is used to validate that the client (such as a mobile device) has the most recent version of a record. When a GET request is made, the ETag is returned as a response header. The ETag also allows the client to make conditional requests.

Should I disable ETag?

ETag is a server response header that allows browsers to make conditional requests and perform cache validation efficiently. So it is better to disable ETag if your website does not need it.

What is ETag header vulnerability?

The remote web server is affected by an information disclosure vulnerability due to the ETag header providing sensitive information that could aid an attacker, such as the inode number of requested files.

What is header unset ETag?

Entity tags (ETags) are a mechanism to check for a newer version of a cached file. By removing the ETag header, you disable caches and browsers from being able to validate files, so they are forced to rely on the Cache-Control and Expires header.

How do I check ETag headers?

Chrome

1. Load the web page that you want to test.
2. Hit F12 to open the Developer Tools.
3. Switch to the Network Tab.
4. Reload the page.
5. Check the main page element first, usually at the top.
6. ETag should be listed under Response Headers on the right side.

How do I get an ETag value?

Generating ETag Value It can be created and updated manually or can be auto-generated. Common methods of its auto-generation include using a hash of the resource’s content or just a hash of the last modification timestamp. The generated hash should be collision-free.

What is ETag in REST API?

An entity tag, or ETag, is a mechanism that is provided by the HTTP protocol so that a browser client or a script can make conditional REST requests for optimistic updating or optimized retrieval of entities.

How do I get an ETag?

How to apply

1. Select the ‘Apply online’ button.
2. Read and accept the Terms and Conditions.
3. Complete the application form.

How do I check my ETag?

Is there a way to remove ETags from http?

This goes in your root .htaccess file but if you have access to httpd.conf that is better. This code uses the FileETag and the Header directive to remove all ETags from being sent. Notice that the ETag performs the same service that Last-Modified header performs.

How to use htaccess in a single line?

Tip: you can combine any Options directives on a single line, for example: This snippet disables Apache’s ETag Header: This technique can provide a small performance boost on certain configurations. For example, disabling ETag is reported to improve performance on clustered servers.

Do you need to add caching rules to your.htaccess file?

Since all modern browsers support Cache-Control headers, you should only need to add these lines to your .htaccess file:

What can you do with Apache htaccess and httpd.conf?

Apache .htaccess and httpd.conf have the power to send and manipulate HTTP Header Requests and responses like sending P3P privacy headers, Content-Type: UTF-8, Content-Language: en-US, etc. The power is immense and you can do some really cool stuff with HTTP Headers!