调用Google地理编码API时Callback未触发，请求超时问题求助

Hey there, let's dig into why your Google Geocoding API call is timing out in your app but working fine in Chrome. Here are the most likely culprits and how to check them:

• First, double-check that ${encodedAddress} is properly URL-encoded. Spaces, commas, and special characters (like # or &) need to be converted to their URL-safe equivalents (e.g., %20 for spaces). Chrome automatically handles encoding when you paste an address, but if your app is manually concatenating the URL without encoding, the request might be malformed—leading to the server failing to parse it and eventually timing out.
• Print the full final URL your app is sending, then paste it directly into Chrome. If it fails here, you know the encoding or parameter setup is the issue.

• Many apps (especially desktop, mobile, or enterprise web apps) use different network configurations than your default Chrome browser. Your app might be routed through a corporate proxy, firewall, or have internal network rules that block outgoing requests to maps.googleapis.com.
• Check your app's network settings: look for custom proxy configurations, firewall rules that restrict external API calls, or any security policies that might be blocking the domain.

• Wait a second—your sample URL doesn't include an API key (&key=YOUR_API_KEY). While Chrome might let you make a few unauthenticated requests under Google's free quota, apps often send more frequent requests that hit quota limits, or fail entirely because unauthenticated requests are throttled heavily.
• Ensure your app's request includes a valid API key that has the Geocoding API enabled in the Google Cloud Console. Also, check if your key has enough remaining quota for requests.

• A 5-minute delay before getting an error suggests your app's HTTP client might be set with overly long timeout values or aggressive retry logic. Instead of failing quickly when the connection can't be established, it's retrying multiple times before giving up.
• Check your app's HTTP client settings: look for timeout thresholds, retry counts, and backoff strategies. Compare this to Chrome's behavior, which fails fast if the connection can't be made.

• If this is a frontend web app running on your own domain, cross-origin resource sharing (CORS) rules might be blocking the request. While Google's Geocoding API supports CORS, misconfigured request headers or missing API keys can trigger CORS errors that manifest as timeouts.
• Open Chrome DevTools, go to the Network tab, and look for the API request. Check if there's a failed OPTIONS preflight request, or if the request is blocked with a CORS-related error message.

Start with the simplest checks first: confirm the full URL your app sends works in Chrome, then add the API key if you haven't already. Those two steps often fix this kind of issue.

内容的提问来源于stack exchange，提问作者Rishabh Kanwar