Expose some headers to fetch requests from the PDF.js Chrome extension #9447
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This is a work-around for https://crbug.com/784528 and allows the PDF.js networking code to perform more optimally. The user-visible effect is a visible progress bar, but this also affects file name determination and range request detection (which were broken because Chrome does not show these headers to callers of
fetch
).Fixes #9446 (tested using the provided test case, step 1 & 2 = progress bar is visible)