Android HTTP请求WiFi环境下失效，移动数据可正常运行

Hey there, let's work through this issue you're having! The fact that your request works on mobile data but fails on WiFi points to network-specific restrictions or configuration issues rather than your code itself. Let's break down the fixes step by step:

1. Verify WiFi Network Accessibility #

First, rule out the simplest cause: is your WiFi network actually allowing access to Facebook?

• Open your phone's browser, connect to the same WiFi, and try loading https://www.facebook.com/. If it fails to load, your WiFi is likely blocking the site (common in public/office networks with firewalls, or regions with DNS restrictions).
• If the browser works but Jsoup doesn't, move to the next steps.

2. Increase Jsoup Timeout #

Jsoup's default timeout is pretty short (3 seconds), which might not be enough for slower WiFi connections. Add a longer timeout to your request:

doc = Jsoup.connect("https://www.facebook.com/")
    .userAgent("Mozilla/5.0 (Windows; U; WindowsNT 5.1; en-US; rv1.8.1.6) Gecko/20070725 Firefox/2.0.0.6")
    .referrer("http://www.google.com")
    .timeout(10000) // 10 seconds timeout
    .get();

3. Check WiFi DNS Configuration #

Faulty DNS settings on your WiFi can prevent domain resolution even if the network allows access. Try switching your WiFi's DNS to a public service like:

• Google DNS: 8.8.8.8 / 8.8.4.4
• Cloudflare DNS: 1.1.1.1 / 1.0.0.1

4. Confirm Manifest Permissions #

Double-check that you've added the required internet permission in your AndroidManifest.xml (it's easy to typo this):

<uses-permission android:name="android.permission.INTERNET" />

Note: Since you're using HTTPS, you don't need extra configuration for cleartext traffic (that's only for HTTP requests on Android 9+).

5. Handle WiFi Proxy Settings #

If your WiFi uses a proxy server, Jsoup won't automatically pick up the system proxy. You'll need to manually add it to your request:

// Replace with your WiFi proxy details
doc = Jsoup.connect("https://www.facebook.com/")
    .userAgent("Mozilla/5.0 (Windows; U; WindowsNT 5.1; en-US; rv1.8.1.6) Gecko/20070725 Firefox/2.0.0.6")
    .referrer("http://www.google.com")
    .proxy("your-proxy-host", 8080) // Example proxy host and port
    .timeout(10000)
    .get();

Start with the first two steps—they're the most likely fixes for your SocketTimeoutException!

内容的提问来源于stack exchange，提问作者Andrei Nutu