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Remove the isFetchSupported function since the Fetch API is available in all supported browsers

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The currently supported browsers, note the minimum versions [listed here](5a4e06af2d/gulpfile.js (L78-L88)), should now have native support for all of the features checked in the `isFetchSupported` function:

 - https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API#browser_compatibility
 - https://developer.mozilla.org/en-US/docs/Web/API/Response#browser_compatibility
 - https://developer.mozilla.org/en-US/docs/Web/API/Body/body#browser_compatibility
 - https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream#browser_compatibility

Hence this function can now be removed, and the code can thus be simplified a little bit.
This commit is contained in:
Jonas Jenwald 2021-06-11 22:53:09 +02:00
parent 5a4e06af2d
commit ddea90b8f6
2 changed files with 24 additions and 62 deletions
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12
src/display/display_utils.js
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@ -49,7 +49,7 @@ class DOMCanvasFactory extends BaseCanvasFactory {
async function fetchData(url, asTypedArray = false) {
if (
(typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
(isFetchSupported() && isValidFetchUrl(url, document.baseURI))
isValidFetchUrl(url, document.baseURI)
) {
const response = await fetch(url);
if (!response.ok) {
@ -483,15 +483,6 @@ class StatTimer {
}
}
function isFetchSupported() {
return (
typeof fetch !== "undefined" &&
typeof Response !== "undefined" &&
"body" in Response.prototype &&
typeof ReadableStream !== "undefined"
);
}
function isValidFetchUrl(url, baseUrl) {
try {
const { protocol } = baseUrl ? new URL(url, baseUrl) : new URL(url);
@ -626,7 +617,6 @@ export {
getFilenameFromUrl,
getPdfFilenameFromUrl,
isDataScheme,
isFetchSupported,
isPdfFile,
isValidFetchUrl,
LinkTarget,