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slightlylate's profile
Alex Russell
Alex Russell
Alex Russell
@slightlylate

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Alex Russell

@slightlylate

Chrome Project 🐡 & Web Standards TL; Blink API OWNER Named PWAs w/ @phae; probably making her ☕ DMs open. Tweets my own; press@google.com for official comms.

San Francisco, The Internet
infrequently.org
Joined December 2010

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    1. Katelyn Gadd‏ @antumbral 31 Jan 2018
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      Replying to @slightlylate

      It's a third party web application. It seems tuned for Safari but most people play it using desktop or mobile Chrome I maintain a desktop extension that fixes a bunch of stuff.

      1 reply 0 retweets 1 like
    2. Alex Russell‏ @slightlylate 31 Jan 2018
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      Replying to @antumbral

      Got it. So the code you're loading is from the extension?

      2 replies 0 retweets 0 likes
    3. Katelyn Gadd‏ @antumbral 31 Jan 2018
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      Replying to @slightlylate

      No, this is all their code. I'm running some logic to inject the prefetch/preload elements. For some reason their XHRs aren't picking up the prefetched data from the memory cache.

      1 reply 0 retweets 1 like
    4. Katelyn Gadd‏ @antumbral 31 Jan 2018
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      Replying to @antumbral @slightlylate

      I'm injecting the prefetch elements from the page's execution context (not a content script) so I don't think sandboxing should be in play. I checked the headers in devtools and they all match (with the exception that their xhrs have an 'origin' header)

      1 reply 0 retweets 0 likes
    5. Katelyn Gadd‏ @antumbral 31 Jan 2018
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      Replying to @antumbral @slightlylate

      I do hook http://xhr.open  and xhr.send so if there's some way I can modify their XHR invocations to make preload actually work, that'd be great. I didn't see anything in docs anywhere.

      1 reply 0 retweets 0 likes
    6. Katelyn Gadd‏ @antumbral 31 Jan 2018
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      Replying to @antumbral @slightlylate

      I previously tried caching and prefetching everything myself using idb, but redirecting their requests to blob: and data: urls was slower (blobs hit disk cache, data urls are slow to decode)

      1 reply 0 retweets 0 likes
    7. Katelyn Gadd‏ @antumbral 3 Feb 2018
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      Replying to @antumbral @slightlylate

      Did you come up with any ideas? Should I file a bug about prefetch not working?

      1 reply 0 retweets 0 likes
    8. Alex Russell‏ @slightlylate 4 Feb 2018
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      Replying to @antumbral

      I suspect you're past the preload scanner by the time you inject that, so perhaps a bug but hard to tell. Big issue here is cache speed.

      1 reply 0 retweets 0 likes
    9. Katelyn Gadd‏ @antumbral 4 Feb 2018
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      Replying to @slightlylate

      Odd since documentation out there insists that doing preload this way should work. I inject them very, very early - hundreds of msec before they actually xhr to get the content.

      1 reply 0 retweets 0 likes
    10. Katelyn Gadd‏ @antumbral 4 Feb 2018
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      Replying to @antumbral @slightlylate

      It preloads all of my injected preloads all at once, too - the whole set completes in like 50ms. So it's doing the preload very efficiently, but then it throws it out or doesn't use it.

      1 reply 0 retweets 1 like
      Alex Russell‏ @slightlylate 4 Feb 2018
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      Replying to @antumbral

      Worth filing a bug. I'll try to raise cache perf issue again with that team. There has been some turnover/priority changes there so will need to figure out who owns.

      4:51 AM - 4 Feb 2018
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        2. Katelyn Gadd‏ @antumbral 4 Feb 2018
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          Replying to @slightlylate

          OK. I'll have to see if I can come up with a reliable repro for this that isn't complicated.

          1 reply 0 retweets 1 like
        3. Katelyn Gadd‏ @antumbral 23 Mar 2018
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          Replying to @antumbral @slightlylate

          At this point I am convinced link rel=preload does not work for fetch and I'm not sure it ever worked. Do you know how comprehensive the test coverage is for this?

          1 reply 0 retweets 0 likes
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