net::ERR_CACHE_OPERATION_NOT_SUPPORTED PDF sometimes does not load

[Rob Smith]

Configuration:

Web browser and its version: Chrome Version 62.0.3202.94 (Official Build) (64-bit)

Operating system and its version: OS-X 10.11.6

What is the expected behavior? PDF loads

What went wrong? PDF sometimes does not load

Possible reason - Range request Fails occasionally  .  It is my understanding that when you see "Provisional headers are shown"  in the network tab that implies the the request was not sent

Steps to reproduce the problem:

1. Load a pdf file and observe  for range requests in dev tools
2. Repeat, clear cache, etc. and sometimes it stalls out with the spinning progress wheel. Other times it does not. When it errors out, Chrome logs an error. Does not seem to happen w/IE 11 or Safari.
3.  Summary - it appears that the disk cache look up is failing and no request is being sent over the network to retrieve the missing data

Screen shot of good request/response headers 

Screen shot of good and bad request sequences 

Screen shot of failed request

[Lei Zhang]

Hi Rob,

This is not the right place to report bugs. Please use https://crbug.com/new and attach a log from chrome://net-export/ if possible.

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