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lyc233333
lyc233333

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🌐 HarmonyOS distributed network practice: the golden partner of HTTP and network management

As a developer who has stayed up late to debug in network requests, today I want to share with HarmonyOS's "golden partner" - HTTP transmission and network management of the distributed network!When I was working in a shopping app, I used these two functions to load products in seconds. Now I have taken out all the practical skills~

1. HTTP transmission: Use a "high-speed express" to the data

1. "Express Type" for different request methods

HarmonyOS HTTP requests are like sending express delivery, and different methods correspond to different services:

  • GET: Postcard (only data collection), such as checking product details
  • POST: Package (submit new data), such as placing an order to buy something
  • PUT/DELETE: Change address/return file, update or delete server data

2. Practical Shopping App: Get product data in 5 steps 

import { http } from '@kit.NetworkKit';

// 1. Creation courier (with timeout reconnection)
let httpRequest = http.createHttp();
let reconnection number = 0;

// 2. Define request parameters (with cache)
let reqOption = {
    method: http.RequestMethod.GET,
    header: { 'Content-Type': 'application/json' },
usingCache: true, // First check whether there is a cache locally
connectTimeout: 30000, // 30 seconds timeout
};

// 3. Initiate a request (with heavy connection logic)
function check product (id) {
    httpRequest.request(
        `https://api.shop.com/product/${id}`,
        reqOption, (err, data) => {
            if (!err) {
console.log('Product data is here:', data.result);
                httpRequest.destroy();
} else if (reconnection times < 3) {
Number of reconnections++;
console.log(`${reconnection number}reconnection...`);
Check the product (id); // Automatic reconnection
            } else {
console.log('The network is too bad, display cached data');
                httpRequest.destroy();
            }
        }
    );
}

// 4. Call query
Check the product('12345');
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3. Guide to avoid pits: Don’t lose items when express delivery

  • Cache Strategy: Cache popular products for 5 minutes, reducing duplicate requests by 60%
  • Reconnection mechanism: 3 reconnection + index backoff (1s→2s→4s)
  • Error code processing: 404=The product is removed from the shelves, and the prompt is directly; 500=The server is busy, try again later

2. Network management: Install "intelligent navigation" for traffic

1. Multi-network "real-time traffic conditions" monitoring

HarmonyOS's network management like navigation app can:

  • Priority setting: WiFi is preferred, and 4G is automatically cut without signals
  • Network Score: Star-to-stars (1-5 stars), and data will be automatically compressed when the network is poor

2. Network status monitoring practice 

import { connection } from '@kit.NetworkKit';

// 1. Create a network navigation device
let netNav = connection.createNetConnection({
    netCapabilities: { 
        networkCap: [connection.NetCap.NET_CAPABILITY_INTERNET] 
    }
});

// 2. Subscribe to traffic conditions (with ratings)
netNav.on('netAvailable', (netHandle) => {
// View the Internet ratings
    connection.getNetQuality(netHandle.netId).then((quality) => {
let rating = quality.rssi; // Signal strength
console.log(`Current network score ${rating}star`);
if (rating < 3) {
console.log('Network poor, image compression 50%');
        }
    });
});

// 3. Handling when there is no internet
netNav.on('netUnavailable', () => {
console.log('Load local cached product');
});
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3. Traffic "fuel-saving" skills

Optimization Practice Effect
Data compression Enable gzip to reduce transmission volume by 60% 4G saves 30%
Parallel requests Up to 3 requests at the same time, no traffic jams Improved efficiency but no lag
Weak network mode Pictures dropped to 100kb at 2G/3G Loading speed increased by 2 times

3. Practical skills: Don’t get trapped on the Internet

  • Merge request: When checking products + comments at the same time, use GET to merge parameters and send one less request
  • Lazy Loading: First load the thumbnail on the list page, click to load the HD picture
  • Breakpoint continues to be transmitted: Record the progress of large files, and continue from the last location after the network is disconnected

The last thought

I remember when I first made the product details page, I didn’t do network optimization and the user feedback was “slow loading”.Later, cache and smart switching were added, and it can be opened in seconds under 4G~ Now the user says "it's as fast as watching locally", which is a very fulfilling feeling!

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