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| Note that we won't be able to image-optimize | |
| https://www.gstatic.com/psa/static/1.gif, and we have disabled | |
| inlining in this directory, so we won't inline it. But we will cache-extend | |
| it because the cache-extender will work on long-ttl files if it also forces | |
| a domain change. Succeeding doing this proves we can fetch it, which we | |
| need to do in order to compute a hash. | |
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| <img src="https://www.gstatic.com/psa/static/1.gif" /> |