How to test whether to use range-requests in pdf.js ?

[wideweide]

Steps to reproduce the problem:

1. I created a servlet for download files from a java file server： head to reponse accept-ranges,support range in header...
2. user pdf.js to show pdf: viewer.html?file=...download/fileid

What is the expected behavior? (add screenshot)
use range-requests

What went wrong? (add screenshot)
but just load the full file then display

So How to test whether to use range-requests in pdf.js ?

[Snuffleupagus]

So How to test whether to use range-requests in pdf.js ?

See

pdf.js/src/display/network_utils.js

Lines 23 to 62 in c218e94

	function validateRangeRequestCapabilities({
	getResponseHeader,
	isHttp,
	rangeChunkSize,
	disableRange,
	}) {
	assert(rangeChunkSize > 0, "Range chunk size must be larger than zero");
	const returnValues = {
	allowRangeRequests: false,
	suggestedLength: undefined,
	};
	const length = parseInt(getResponseHeader("Content-Length"), 10);
	if (!Number.isInteger(length)) {
	return returnValues;
	}
	returnValues.suggestedLength = length;
	if (length <= 2 * rangeChunkSize) {
	// The file size is smaller than the size of two chunks, so it does not
	// make any sense to abort the request and retry with a range request.
	return returnValues;
	}
	if (disableRange || !isHttp) {
	return returnValues;
	}
	if (getResponseHeader("Accept-Ranges") !== "bytes") {
	return returnValues;
	}
	const contentEncoding = getResponseHeader("Content-Encoding") || "identity";
	if (contentEncoding !== "identity") {
	return returnValues;
	}
	returnValues.allowRangeRequests = true;
	return returnValues;
	}

If that's not enough to answer your question, then please provide all of the information requested in https://github.com/mozilla/pdf.js/blob/master/.github/ISSUE_TEMPLATE.md since as-is this issue doesn't really seem actionable; please also see https://github.com/mozilla/pdf.js/blob/master/.github/CONTRIBUTING.md (emphasis mine):

If you are developing a custom solution, first check the examples at https://github.com/mozilla/pdf.js#learning and search existing issues. If this does not help, please prepare a short well-documented example that demonstrates the problem and make it accessible online on your website, JS Bin, GitHub, etc. before opening a new issue or contacting us in the Matrix room -- keep in mind that just code snippets won't help us troubleshoot the problem.