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I am seeing increased number of calls from via ggpht.com GoogleImageProxy agent for some of the URL fetches. Details: I have put in an image in the email html body. When I open the email, I expect a call to be made to my server to fetch this image. However, since Gmail uses its proxy server, I see multiple calls made at regular intervals (about ~500 calls per image. In one instance I have logs for 5000 calls for one image as well).
Any idea why the same image is fetched so many times?
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Google Image Proxy is a Google service that anonymizes image requests for Gmail. Filippo Valsorda has a good write up here of how the service works. The important take away is that this service proxies any requests for image resources that are meant to be displayed in Gmail.
An image proxy is a service that fetches and re-serves images from a new URL, used by IndieWeb sites to provide better performance, fidelity, and/or reliability of images embedded in posts.
The Google Image Proxy is a caching proxy server. Every time an image link is included in email the request will go to the Google Image Proxy first to see if it has been cached, if so it should serve it up from the proxy or it will go fetch it and cache it there after.
This is an old question but because this is served by Google search: GoogleImagProxy anonymizes Gmail openings. So, if you use a newletter or auto-responder and somebody opens an email containing an image, usear-agent shows as GoogleImageProxy.
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