I hope you are well!
Since the problem is not directly related to RadEditor, I looked at Google for the reported behavior and found the following discussion on the topic:
Ok, a final update with this. It turns out, for me anyway, that the problem is with Virgin Media's version of gmail rather than gmail as a whole. So not as big a problem as I'd imagined for clients, but still pretty poor service by them.
I had a similar issue for our customers. I knocked together a quick script(https://gist.github.com/ritwikSOP/5d1be5e2a09f0c65fa6b) to pull the same url 100 times and check the performance, and I get a mix of 404s and 500s from the Google image proxy for Gmail. In fact, I only had about 78% of those requests returning 200s which is pretty appalling for something they've rolled out to everyone. Surely 100 sequential request for the same image should have a better success rate?
A blog pos on the issue: https://blog.filippo.io/how-the-new-gmail-image-proxy-works-and-what-this-means-for-you/.
A SO discussion on it: Gmail's new image caching is breaking image links in newsletter:
Following is the only way to force GoogleImageProxy to fetch your images
- Rename your images to something else with png, jpg or gif extensions only.
- Don't use any kind of query string in your image url like
- your image must include png, jpg or gif as an extension.
- your image url must be mapped onto your image directly.
- If you need to use some proxy url for your protected images then your response must include the proper header like
- File extension and content-type header must match
- Status-code must be 200 instead of 403, 500 etc
I hope the above information will help you resolve the problem. Please share your experience here at the forum when you solved it out.
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