告别404！本文利用GitHub+Cloudflare+PicList的完美组合，手把手教你搭建永不消失的免费图床，优化图片加载速度，提升博客体验。

4、Cloudflare加速图床访问

const upstream_path = "/github用户/github仓库名/分支"
const github_token = "github的token";

// Website you intended to retrieve for users.
// GitHub提供的直接访问仓库原始文件的域名（如代码、图片、文本）。
const upstream = "raw.githubusercontent.com";

// Custom pathname for the upstream website.
// ①自定义上游网站的路径：格式为 /<用户>/<仓库名>/<分支>
const upstream_path = "/chinapmcc/img/main";

// github personal access token.
// ②填写github个人令牌
const github_token = "ghp_rYMGrgOuZoxxxxxxx3qWSpN";

// Website you intended to retrieve for users using mobile devices.
// 你打算为使用移动设备的用户检索的网站。
const upstream_mobile = upstream;

// Countries and regions where you wish to suspend your service.
// 你希望暂停服务的国家和地区
const blocked_region = [];

// IP addresses which you wish to block from using your service.
// 你希望阻止使用服务的IP地址
const blocked_ip_address = ["0.0.0.0", "127.0.0.1"];

// Whether to use HTTPS protocol for upstream address.
// 是否使用HTTPS协议访问上游地址
const https = true;

// Whether to disable cache.
// 是否禁用缓存
const disable_cache = false;

// Replace texts.
// 替换文本
const replace_dict = {
$upstream: "$custom_domain",
};

addEventListener("fetch", (event) => {
  event.respondWith(fetchAndApply(event.request));
});

asyncfunctionfetchAndApply(request) {
const region = request.headers.get("cf-ipcountry")?.toUpperCase();
const ip_address = request.headers.get("cf-connecting-ip");
const user_agent = request.headers.get("user-agent");

let response = null;
let url = newURL(request.url);
let url_hostname = url.hostname;

if (https == true) {
    url.protocol = "https:";
  } else {
    url.protocol = "http:";
  }

if (awaitdevice_status(user_agent)) {
    var upstream_domain = upstream;
  } else {
    var upstream_domain = upstream_mobile;
  }

  url.host = upstream_domain;
if (url.pathname == "/") {
    url.pathname = upstream_path;
  } else {
    url.pathname = upstream_path + url.pathname;
  }

if (blocked_region.includes(region)) {
    response = newResponse(
      "Access denied: WorkersProxy is not available in your region yet.",
      {
        status: 403,
      }
    );
  } elseif (blocked_ip_address.includes(ip_address)) {
    response = newResponse(
      "Access denied: Your IP address is blocked by WorkersProxy.",
      {
        status: 403,
      }
    );
  } else {
    let method = request.method;
    let request_headers = request.headers;
    let new_request_headers = newHeaders(request_headers);

    new_request_headers.set("Host", upstream_domain);
    new_request_headers.set("Referer", url.protocol + "//" + url_hostname);
    new_request_headers.set("Authorization", "token " + github_token);

    let original_response = awaitfetch(url.href, {
      method: method,
      headers: new_request_headers,
      body: request.body,
    });

    connection_upgrade = new_request_headers.get("Upgrade");
    if (connection_upgrade && connection_upgrade.toLowerCase() == "websocket") {
      return original_response;
    }

    let original_response_clone = original_response.clone();
    let original_text = null;
    let response_headers = original_response.headers;
    let new_response_headers = newHeaders(response_headers);
    let status = original_response.status;

    if (disable_cache) {
      new_response_headers.set("Cache-Control", "no-store");
    } else {
      new_response_headers.set("Cache-Control", "max-age=43200000");
    }

    new_response_headers.set("access-control-allow-origin", "*");
    new_response_headers.set("access-control-allow-credentials", true);
    new_response_headers.delete("content-security-policy");
    new_response_headers.delete("content-security-policy-report-only");
    new_response_headers.delete("clear-site-data");

    if (new_response_headers.get("x-pjax-url")) {
      new_response_headers.set(
        "x-pjax-url",
        response_headers
          .get("x-pjax-url")
          .replace("//" + upstream_domain, "//" + url_hostname)
      );
    }

    const content_type = new_response_headers.get("content-type");
    if (
      content_type != null &&
      content_type.includes("text/html") &&
      content_type.includes("UTF-8")
    ) {
      original_text = awaitreplace_response_text(
        original_response_clone,
        upstream_domain,
        url_hostname
      );
    } else {
      original_text = original_response_clone.body;
    }

    response = newResponse(original_text, {
      status,
      headers: new_response_headers,
    });
  }
return response;
}

asyncfunctionreplace_response_text(response, upstream_domain, host_name) {
let text = await response.text();

var i, j;
for (i in replace_dict) {
    j = replace_dict[i];
    if (i == "$upstream") {
      i = upstream_domain;
    } elseif (i == "$custom_domain") {
      i = host_name;
    }

    if (j == "$upstream") {
      j = upstream_domain;
    } elseif (j == "$custom_domain") {
      j = host_name;
    }

    let re = newRegExp(i, "g");
    text = text.replace(re, j);
  }
return text;
}

asyncfunctiondevice_status(user_agent_info) {
var agents = [
    "Android",
    "iPhone",
    "SymbianOS",
    "Windows Phone",
    "iPad",
    "iPod",
  ];
var flag = true;
for (var v = 0; v < agents.length; v++) {
    if (user_agent_info.indexOf(agents[v]) > 0) {
      flag = false;
      break;
    }
  }
return flag;
}

https://raw.githubusercontent.com

https://raw.gitmirror.com

https://raw.githubusercontent.com/chinapmcc/img/master/PicGO+Typora.gif

https://raw.gitmirror.com/chinapmcc/img/master/PicGO+Typora.gif

https://gist.githubusercontent.com

https://gist.gitmirror.com

https://gist.gitmirror.com/chinapmcc/5a8ufjytwh1b/raw/520/create-user.sh

https://cdn.gitmirror.com

https://cdn.gitmirror.com/gh/chinapmcc/img/main/maker.ps1