Google静态地图API自定义标记间歇性丢失问题求助

Hey everyone, let me walk through the frustrating intermittent issue we're hitting with the Google Static Maps API, along with what we've checked so far—hoping to get guidance from the community or Google's technical team.

The Issue #

We’ve relied on the API without problems for months, but recently our custom marker icons are behaving erratically:

• Intermittent Loading: Sometimes the custom icon displays correctly; other times it defaults to the standard red marker.
• Error Warning: When it fails, a yellow bar shows up in the top right with the message "Map error: g.co/staticmaperror".
• Response Header Clue: The failing requests include this warning header:

  x-staticmap-api-warning: Failed to fetch image url https://www.xyz.de/some_image.png
  

We’ve run repeated tests with the exact same request URL, and out of n total requests, m ≤n succeed while o ≤n throw the error above.

What We’ve Verified On Our End #

• Direct Image Access: Requesting the marker image URL directly from our systems works 100% of the time—no firewall blocks, no server errors.
• Cache Configuration: The image has a properly set cache-control header with a 2-week max-age, a valid ETag, and no non-standard settings.
• Valid Request URL: Our static map request is structured correctly (sensitive values redacted):

  https://maps.googleapis.com/maps/api/staticmap?key=<OUR_KEY>&size=260x130&maptype=roadmap&format=png&visual_refresh=true&zoom=10&markers=icon:https://www.xyz.de/some_image.png|52.52008961%2C13.40465566&signature=<SIG>
  

Our leading hypothesis is that this ties back to Google’s image caching mechanism, but we’re stuck on pinpointing the root cause.

Potential Next Steps & Questions #

We’re exploring these avenues, but would love input:

• CORS Checks: Could Google’s servers be hitting CORS restrictions when fetching our image? We’re verifying if our server allows requests from Google’s static map domains.
• Googlebot Simulation: We plan to test fetching the image with a Googlebot User-Agent to replicate Google’s perspective and see if we can trigger the intermittent failure.
• Cache Header Tweaks: Might adjusting our cache-control or ETag settings resolve conflicts with Google’s caching logic? We’re considering temporary changes to test this.
• Image Performance: Could slow server response times for the image cause Google’s fetch to timeout intermittently? We’re auditing the image’s file size and server response speed.

Most importantly, we’d appreciate support from Google’s technical team to investigate if there’s an issue with how their static map service caches or fetches external marker images.

内容的提问来源于stack exchange，提问作者m02ph3u5