Exploring the Benefits of Implementing Etag in Sails.js

Currently, I am seeking ways to enhance the cache capabilities of my Sails application.

Sails generates an Etag with its response. However, despite sending a GET request with an 'if-None-Match' header containing the Etag from the previous response, I am unable to receive a '304 not Modified' response from the server. The actual response remains unmodified and the Etag received is identical to the previous one.

I have been using POSTMAN for testing the server responses.

Is there a method for a Sails server to return such a status code for unmodified responses? I have searched the Sails documentation but could not find any resources regarding the usage of Etags.

Your assistance is greatly appreciated.

expresssails.jsetagpostmanhttp-status-code-304

Answer №1

Sails.js is a framework built on top of Express.js, which handles the generation of ETags. According to information provided in this source, weak ETags are created using CRC32 and strong ETags are generated using MD5.

Personally, I prefer using DHC - REST/HTTP API Client with the If-None-Match header as it allows for perfect functioning with responses like 304 Not Modified.

In my experience, POSTMAN adds the NO-CACHE header when sending requests to the server for testing purposes:

'cache-control': 'no-cache',

To resolve this issue, you can refer to this helpful answer that explains how to disable this feature and ensure everything runs smoothly.

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