What is the ETag header in Express.js?
An example of an AI chatbot conversation about understanding the ETag header in Express.js.
What is the ETag header in Express.js?
The ETag header is used for web cache validation. It helps to determine if the content has changed.
How does it improve performance?
By using ETags, the server can avoid sending the full response if the content hasn't changed, reducing bandwidth.
Can you show me how to implement it in an Express.js app?
Sure! You can use the res.set('ETag', value) method to set the ETag header in your response.
Are there any downsides to using ETags?
Yes, ETags can add overhead in terms of server processing and may not be necessary for all applications.
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