Explore eight clever tricks for utilizing the Fetch() API, including efficient streaming of data and handling download progress. Discover how to manage cancellations with AbortController and leverage user interactions. Dive into complex response management, complete with humorous error handling and advanced debugging techniques. Unlock faster, more effective data retrieval strategies and enhance your web development skills with practical implementations.
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Stream Fetch Responses
Use the Fetch API's response.body to stream data.
This allows processing large files or displaying progress updates.
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Track Download Progress
Clone the response stream to track download progress without consuming the data.
Calculate progress by comparing downloaded chunks with the total content-length.
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Cancel Fetch Requests
Cancel ongoing Fetch requests using AbortController.
This helps manage multiple requests or stop downloads when needed.
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// Create a new TextDecoder instance const decoder = new TextDecoder(); // Make the fetch request fetch('https://api.example.com/streaming-data') .then(response => { // Check if the response is valid if (!response.ok) { throw new Error('Network response was not ok'); } // Stream the response data using a TextDecoder const reader = response.body.getReader(); // Function to read the streamed chunks function read() { return reader.read().then(({ done, value }) => { // Check if the streaming is complete if (done) { console.log('Streaming complete'); return; } // Decode and process the streamed data const decodedData = decoder.decode(value, { stream: true }); console.log(decodedData); // Continue reading the next chunk return read(); }); } // Start reading the chunks return read(); }) .catch(error => { // Handle errors console.log('Error:', error); });
// Create an AbortController instance const controller = new AbortController(); // Set a timeout to abort the request after 5 seconds const timeout = setTimeout(() => { controller.abort(); }, 5000); // Fetch request with the AbortController fetch('https://api.example.com/data', { signal: controller.signal })
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