Скачать или смотреть Resolving the Issue of Express.js Limiting Requests to 5

Encountering difficulties with `Express.js` only accepting five requests? Discover why this happens and how to solve it in your React application in this detailed guide.
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This video is based on the question https://stackoverflow.com/q/64070531/ asked by the user 'Milad Deraawi' ( https://stackoverflow.com/u/11823380/ ) and on the answer https://stackoverflow.com/a/64070781/ provided by the user 'jfriend00' ( https://stackoverflow.com/u/816620/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the Issue of Express.js Limiting Requests to 5: A Comprehensive Guide

If you've been developing a web application using React and Express, you may have encountered a frustrating problem: your Express server only seems to accept five requests, and when you try to send a sixth one, it simply stops responding. This common issue can halt your workflow and cause unnecessary bottlenecks in development. In this post, we will break down the reasons behind this limitation and provide you with clear steps to resolve it.

Understanding the Problem

When you send requests from your React client to your Express server, it's essential to understand that the browser imposes a limit on the number of concurrent requests to the same domain. For most modern browsers, this limit is around five requests. Once you reach this cap, the browser will queue any additional requests until one of the earlier requests completes.

Why Does This Happen?

Browser Limitations: Each browser has its own set of rules regarding how many requests it can handle to the same host simultaneously, typically around five. Thus:

First Request: Sent immediately.

Second to Fifth Requests: Handled concurrently.

Sixth Request and Beyond: Queued until one of the first five completes.

Response Management: If the server does not send a response for each request it receives, the pending requests will remain in limbo, further increasing the risk of hitting the limit.

Solutions to the Issue

1. Optimize Your API Design

One effective way to handle this limitation is to rethink the design of your API. Here are a few strategies you might consider:

Combine Requests: Instead of making multiple requests for different pieces of data, try to combine them into a single larger request. This reduces overhead and maximizes efficiency.

Use Pagination: If you are fetching large datasets, implement pagination to limit the amount of data fetched in one go.

2. Ensure Proper Responses Are Sent

Make sure your server is correctly responding to every request. The code provided in your question indicates that you aren't sending any response back to the client, which leads to requests hanging.

Here's how you can modify your Express route:

[[See Video to Reveal this Text or Code Snippet]]

3. Implementing Additional Hostnames

As a more advanced solution, some developers use multiple subdomains or hostnames that point to the same server to bypass the request limit. This way, requests can be distributed:

api1.yourdomain.com

api2.yourdomain.com

While this method may help scale beyond the request cap, it is generally more complex to manage and isn’t necessary for most applications.

Conclusion

Running into the Express.js limitation of five concurrent requests can be frustrating, but understanding the cause and implementing the above solutions can help alleviate the issues. By redesigning your API to optimize requests and ensuring that every request receives a response, you can create a smoother workflow and enhance the overall user experience of your application.

This post has provided you with insights into why this limitation exists and how to effectively work around it. Happy coding!