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sadsad
(version: 0)
Comparing performance of:
cors vs no-cors
Created:
4 years ago
by:
Guest
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Tests:
cors
fetch('https://blockchain.info/ticker') .then(response => response.status) .then(status => console.log(status));
no-cors
fetch('https://blockchain.info/ticker', {mode: 'no-cors'}) .then(response => response.status) .then(status => console.log(status));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
cors
no-cors
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into explaining the provided benchmark. **What is tested?** The provided benchmark tests two different approaches to making HTTP requests with the `fetch` API: 1. **Cors-enabled request**: This test fetches data from `https://blockchain.info/ticker` using a standard CORS (Cross-Origin Resource Sharing) enabled request. 2. **No-CORS request**: This test fetches data from `https://blockchain.info/ticker` using a request with the `mode: 'no-cors'` option, which disables CORS and allows the browser to access only the response headers. **Options compared** The two approaches are compared in terms of their execution speed. The benchmark measures how many executions per second (ExecutionsPerSecond) each approach can handle on different devices (Desktop, Mobile). **Pros and Cons:** 1. **Cors-enabled request** * Pros: + Provides a more secure way to access data from external sources. + Allows for more flexibility in handling responses. * Cons: + May be slower due to the additional overhead of CORS checks. 2. **No-CORS request** * Pros: + Faster execution speed, as it bypasses CORS checks. * Cons: + Restricts access to only response headers, limiting its utility. **Library and its purpose** The `fetch` API is a modern JavaScript library for making HTTP requests. It provides a simple and intuitive way to fetch data from web servers. **Special JS feature or syntax** The benchmark uses the `mode: 'no-cors'` option in the second test case, which is a relatively advanced feature of the `fetch` API. This option allows the browser to access only response headers when making a request without CORS support. **Other alternatives** If you need to make HTTP requests with JavaScript, other alternatives include: 1. **XMLHttpRequest**: An older API for making HTTP requests. 2. **AJAX**: A way of accessing web pages dynamically using HTTP requests. 3. **jQuery.ajax`: A part of the jQuery library that provides an easy-to-use interface for making HTTP requests. Keep in mind that the `fetch` API is generally considered a more modern and efficient approach to making HTTP requests in JavaScript, as it provides a simpler and more intuitive way to fetch data from web servers.
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