How to avoid concurrency using etag in sharepoint?

If you are getting only one element using a GET request, you will be able to get Etag using the code mentioned below. If you are getting multiple elements using a GET request, you will be able to get Etag using the code mentioned below. Here, i is the index of the row item in the result set. How Etag is connected to concurrency?
One may also ask, what does the ETag value do in SharePoint?
ETag value is a part of the HTTP protocol that allows concurrency control and web cache validation. ETag is a broader topic when considered in general, but the main focus on this article is to discuss about REST API usage within SharePoint.
In fact, how are ETags used to manage concurrency control? With the adherence to the OData standards, we can do this and more using eTags to manage concurrency. Concurrency control is a thorny problem in computer science. It refers to the situation where more than one person requests to change (either via update or delete) a piece of data stored somewhere.
Keeping this in consideration, what can the ETag be used for in http?
The ETag is a part of HTTP, it could be used for optimistic concurrency control as a way to help prevent ghost writes. Please check the following article for more details:
And, what happens if ETag does not match in REST API call?
- You can pass a header "IF-MATCH" in your REST API call. If the Etag values don’t match it will throw an error like below. Here we are going to update a list item. HTML and REST API code is given below. Comments are given to easily understand the code.

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How does mccs sharepoint ( sharepoint ) sharepoint internet access work?

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Which is better sharepoint online or sharepoint on premises?

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Is the sharepoint form designer compatible with standard sharepoint forms?

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What makes sharepoint look like anything but sharepoint?

As a SharePoint consultant, clients often asked me to make it look like "anything but SharePoint". A SharePoint Intranet arrived in pieces, like the parts of a house delivered to a building site, leaving customers to spend hundreds of thousands of dollars putting them together.

Can you create a sharepoint 2010 workflow in sharepoint designer 2013?

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What are sharepoint tiles or sharepoint promoted links?

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How is sharepoint 2013 similar to sharepoint 2010?

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Is there a way to migrate sharepoint 2013 to sharepoint online?

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Can you migrate from sharepoint server to sharepoint online?

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Can you call sharepoint assemblies other than sharepoint.dll?

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How to connect web parts in sharepoint sharepoint?

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How to edit default.aspx on sharepoint site without sharepoint designer?

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How to manage site creation in sharepoint-sharepoint?

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Which is better sharepoint or sharepoint knowledge base?

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What's the difference between sharepoint webparts and sharepoint dwp?

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What's the difference between sharepoint and sharepoint flex?

SharePoint Flex is a fully configurable SharePoint-based CRM solution. However, SharePoint Flex was built to manage much more than customer relationships.

What's the difference between sharepoint 2010 and sharepoint 2013?

In this article, we will take a look at the differences between Discussion Board lists in SharePoint 2010 and Discussion Board lists in SharePoint 2013. As you know, the Discussion Board is used for communication among team members. Therefore, we need features to support following the conversation clearly.