For some reason its not possible to access GitHub raw links via Jio's connection. So a tiny temporary unreliable fix.

github-raw-jio-fix.user.js

// ==UserScript==
// @name         GitHub raw links bypasser for Jio connections
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  For some reason its not possible to access GitHub raw links via Jio's connection. So a tiny temp unreliable fix.
// @author       Dunkan <https://github.com/dcdunkan>
// @match        http*://github.com/*
// @match        http*://raw.githubusercontent.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=github.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    const observer = new MutationObserver(function () {
        const elements = [
            ...document.getElementsByTagName("a"),
            ...document.getElementsByTagName("img"),
        ];
        let changedCount = 0;
        for (const element of elements) {
            const attributeName = element.tagName === "IMG"
            ? "src"
            : element.tagName === "A"
            ? "href"
            : "";
            const link = element[attributeName];
            if (
                link === "" && !link.includes("://") && !link.startsWith("http:") &&
                !link.startsWith("https:") && !link.startsWith("/")
            ) continue;
            const url = new URL(link, "https://github.com");
            const params = new URLSearchParams(url.search);
            const pathSegments = url.pathname.split("/");
            if (url.hostname === "raw.githubusercontent.com") {
                url.hostname = "gre.deno.dev";
            } else if ( // github.com/user/repo/raw/path || github.com/user/repo/blob/path?raw=true
                url.hostname === "github.com" && pathSegments[1] !== "" &&
                pathSegments[2] !== "" && pathSegments[4] !== "" && pathSegments[5] !== "" &&
                (pathSegments[3] === "raw" || (pathSegments[3] === "blob" && params.get("raw") === "true"))
            ) {
                url.hostname = "gre.deno.dev";
                pathSegments.splice(3, 1);
                url.pathname = pathSegments.join("/");
                console.log("lel", url);
            } else {
                continue;
            }
            element[attributeName] = url.toString();
            changedCount++;
        }
        console.info(`${changedCount} changed to GRE link${changedCount > 1 ? "s" : ""}`);
    });
    observer.observe(document.body, {
        subtree: true,
        childList: true,
        attributes: true,
        attributeFilter: ["src", "href"]
    });
})();