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  • Why httpS Fails To Load on HTTP Request via Multiparameter in cURL in PHP Code?

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    Answer it

    Php Gurus!

    This is a php web proxy called Mini Proxy not written by me.
    Why do https pages show blank white when I visit any https pages with the proxy ? 
    I reckon the https pages are failing to load. Why do you think that is ?

    You can see the actual code here if you want to see it with line numbers:
    https://github.com/joshdick/miniProxy/blob/master/miniProxy.php

    Which line of the code should I change to what ?

    [code]
    <?php
    /*
    miniProxy - A simple PHP web proxy. <https://github.com/joshdick/miniProxy>
    Written and maintained by Joshua Dick <http://joshdick.net>.
    miniProxy is licensed under the GNU GPL v3 <http://www.gnu.org/licenses/gpl.html>.
    */
    /****************************** START CONFIGURATION ******************************/
    //To allow proxying any URL, set $whitelistPatterns to an empty array (the default).
    //To only allow proxying of specific URLs (whitelist), add corresponding regular expressions
    //to the $whitelistPatterns array. Enter the most specific patterns possible, to prevent possible abuse.
    //You can optionally use the "getHostnamePattern()" helper function to build a regular expression that
    //matches all URLs for a given hostname.
    $whitelistPatterns = array(
      //Usage example: To support any URL at example.net, including sub-domains, uncomment the
      //line below (which is equivalent to [ @^https?://([a-z0-9-]+\.)*example\.net@i ]):
      //getHostnamePattern("example.net")
    );
    //To enable CORS (cross-origin resource sharing) for proxied sites, set $forceCORS to true.
    $forceCORS = false;
    //Set to false to report the client machine's IP address to proxied sites via the HTTP `x-forwarded-for` header.
    //Setting to false may improve compatibility with some sites, but also exposes more information about end users to proxied sites.
    $anonymize = true;
    //Start/default URL that that will be proxied when miniProxy is first loaded in a browser/accessed directly with no URL to proxy.
    //If empty, miniProxy will show its own landing page.
    $startURL = "";
    //When no $startURL is configured above, miniProxy will show its own landing page with a URL form field
    //and the configured example URL. The example URL appears in the instructional text on the miniProxy landing page,
    //and is proxied when pressing the 'Proxy It!' button on the landing page if its URL form is left blank.
    $landingExampleURL = "https://example.net";
    /****************************** END CONFIGURATION ******************************/
    ob_start("ob_gzhandler");
    if (version_compare(PHP_VERSION, "5.4.7", "<")) {
      die("miniProxy requires PHP version 5.4.7 or later.");
    }
    $requiredExtensions = ['curl', 'mbstring'];
    foreach($requiredExtensions as $requiredExtension) {
      if (!extension_loaded($requiredExtension)) {
        die("miniProxy requires PHP's \"" . $requiredExtension . "\" extension. Please install/enable it on your server and try again.");
      }
    }
    //Helper function for use inside $whitelistPatterns.
    //Returns a regex that matches all HTTP[S] URLs for a given hostname.
    function getHostnamePattern($hostname) {
      $escapedHostname = str_replace(".", "\.", $hostname);
      return "@^https?://([a-z0-9-]+\.)*" . $escapedHostname . "@i";
    }
    //Helper function used to removes/unset keys from an associative array using case insensitive matching
    function removeKeys(&$assoc, $keys2remove) {
      $keys = array_keys($assoc);
      $map = array();
      $removedKeys = array();
      foreach ($keys as $key) {
        $map[strtolower($key)] = $key;
      }
      foreach ($keys2remove as $key) {
        $key = strtolower($key);
        if (isset($map[$key])) {
          unset($assoc[$map[$key]]);
          $removedKeys[] = $map[$key];
        }
      }
      return $removedKeys;
    }
    if (!function_exists("getallheaders")) {
      //Adapted from http://www.php.net/manual/en/function.getallheaders.php#99814
      function getallheaders() {
        $result = array();
        foreach($_SERVER as $key => $value) {
          if (substr($key, 0, 5) == "HTTP_") {
            $key = str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($key, 5)))));
            $result[$key] = $value;
          }
        }
        return $result;
      }
    }
    $usingDefaultPort =  (!isset($_SERVER["HTTPS"]) && $_SERVER["SERVER_PORT"] === 80) || (isset($_SERVER["HTTPS"]) && $_SERVER["SERVER_PORT"] === 443);
    $prefixPort = $usingDefaultPort ? "" : ":" . $_SERVER["SERVER_PORT"];
    //Use HTTP_HOST to support client-configured DNS (instead of SERVER_NAME), but remove the port if one is present
    $prefixHost = $_SERVER["HTTP_HOST"];
    $prefixHost = strpos($prefixHost, ":") ? implode(":", explode(":", $_SERVER["HTTP_HOST"], -1)) : $prefixHost;
    define("PROXY_PREFIX", "http" . (isset($_SERVER["HTTPS"]) ? "s" : "") . "://" . $prefixHost . $prefixPort . $_SERVER["SCRIPT_NAME"] . "?");
    //Makes an HTTP request via cURL, using request data that was passed directly to this script.
    function makeRequest($url) {
      global $anonymize;
      //Tell cURL to make the request using the brower's user-agent if there is one, or a fallback user-agent otherwise.
      $user_agent = $_SERVER["HTTP_USER_AGENT"];
      if (empty($user_agent)) {
        $user_agent = "Mozilla/5.0 (compatible; miniProxy)";
      }
      $ch = curl_init();
      curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
      //Get ready to proxy the browser's request headers...
      $browserRequestHeaders = getallheaders();
      //...but let cURL set some headers on its own.
      $removedHeaders = removeKeys($browserRequestHeaders, array(
        "Accept-Encoding", //Throw away the browser's Accept-Encoding header if any and let cURL make the request using gzip if possible.
        "Content-Length",
        "Host",
        "Origin"
      ));
      array_change_key_case($removedHeaders, CASE_LOWER);
      curl_setopt($ch, CURLOPT_ENCODING, "");
      //Transform the associative array from getallheaders() into an
      //indexed array of header strings to be passed to cURL.
      $curlRequestHeaders = array();
      foreach ($browserRequestHeaders as $name => $value) {
        $curlRequestHeaders[] = $name . ": " . $value;
      }
      if (!$anonymize) {
        $curlRequestHeaders[] = "X-Forwarded-For: " . $_SERVER["REMOTE_ADDR"];
      }
      //Any `origin` header sent by the browser will refer to the proxy itself.
      //If an `origin` header is present in the request, rewrite it to point to the correct origin.
      if (array_key_exists('origin', $removedHeaders)) {
        $urlParts = parse_url($url);
        $port = $urlParts['port'];
        $curlRequestHeaders[] = "Origin: " . $urlParts['scheme'] . "://" . $urlParts['host'] . (empty($port) ? "" : ":" . $port);
      };
      curl_setopt($ch, CURLOPT_HTTPHEADER, $curlRequestHeaders);
      //Proxy any received GET/POST/PUT data.
      switch ($_SERVER["REQUEST_METHOD"]) {
        case "POST":
          curl_setopt($ch, CURLOPT_POST, true);
          //For some reason, $HTTP_RAW_POST_DATA isn't working as documented at
          //http://php.net/manual/en/reserved.variables.httprawpostdata.php
          //but the php://input method works. This is likely to be flaky
          //across different server environments.
          //More info here: http://stackoverflow.com/questions/8899239/http-raw-post-data-not-being-populated-after-upgrade-to-php-5-3
          //If the miniProxyFormAction field appears in the POST data, remove it so the destination server doesn't receive it.
          $postData = Array();
          parse_str(file_get_contents("php://input"), $postData);
          if (isset($postData["miniProxyFormAction"])) {
            unset($postData["miniProxyFormAction"]);
          }
          curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postData));
        break;
        case "PUT":
          curl_setopt($ch, CURLOPT_PUT, true);
          curl_setopt($ch, CURLOPT_INFILE, fopen("php://input", "r"));
        break;
      }
      //Other cURL options.
      curl_setopt($ch, CURLOPT_HEADER, true);
      curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
      curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
      //Set the request URL.
      curl_setopt($ch, CURLOPT_URL, $url);
      //Make the request.
      $response = curl_exec($ch);
      $responseInfo = curl_getinfo($ch);
      $headerSize = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
      curl_close($ch);
      //Setting CURLOPT_HEADER to true above forces the response headers and body
      //to be output together--separate them.
      $responseHeaders = substr($response, 0, $headerSize);
      $responseBody = substr($response, $headerSize);
      return array("headers" => $responseHeaders, "body" => $responseBody, "responseInfo" => $responseInfo);
    }
    //Converts relative URLs to absolute ones, given a base URL.
    //Modified version of code found at http://nashruddin.com/PHP_Script_for_Converting_Relative_to_Absolute_URL
    function rel2abs($rel, $base) {
      if (empty($rel)) $rel = ".";
      if (parse_url($rel, PHP_URL_SCHEME) != "" || strpos($rel, "//") === 0) return $rel; //Return if already an absolute URL
      if ($rel[0] == "#" || $rel[0] == "?") return $base.$rel; //Queries and anchors
      extract(parse_url($base)); //Parse base URL and convert to local variables: $scheme, $host, $path
      $path = isset($path) ? preg_replace("#/[^/]*$#", "", $path) : "/"; //Remove non-directory element from path
      if ($rel[0] == "/") $path = ""; //Destroy path if relative url points to root
      $port = isset($port) && $port != 80 ? ":" . $port : "";
      $auth = "";
      if (isset($user)) {
        $auth = $user;
        if (isset($pass)) {
          $auth .= ":" . $pass;
        }
        $auth .= "@";
      }
      $abs = "$auth$host$port$path/$rel"; //Dirty absolute URL
      for ($n = 1; $n > 0; $abs = preg_replace(array("#(/\.?/)#", "#/(?!\.\.)[^/]+/\.\./#"), "/", $abs, -1, $n)) {} //Replace '//' or '/./' or '/foo/../' with '/'
      return $scheme . "://" . $abs; //Absolute URL is ready.
    }
    //Proxify contents of url() references in blocks of CSS text.
    function proxifyCSS($css, $baseURL) {
      // Add a "url()" wrapper to any CSS @import rules that only specify a URL without the wrapper,
      // so that they're proxified when searching for "url()" wrappers below.
      $sourceLines = explode("\n", $css);
      $normalizedLines = [];
      foreach ($sourceLines as $line) {
        if (preg_match("/@import\s+url/i", $line)) {
          $normalizedLines[] = $line;
        } else {
          $normalizedLines[] = preg_replace_callback(
            "/(@import\s+)([^;\s]+)([\s;])/i",
            function($matches) use ($baseURL) {
              return $matches[1] . "url(" . $matches[2] . ")" . $matches[3];
            },
            $line);
        }
      }
      $normalizedCSS = implode("\n", $normalizedLines);
      return preg_replace_callback(
        "/url\((.*?)\)/i",
        function($matches) use ($baseURL) {
            $url = $matches[1];
            //Remove any surrounding single or double quotes from the URL so it can be passed to rel2abs - the quotes are optional in CSS
            //Assume that if there is a leading quote then there should be a trailing quote, so just use trim() to remove them
            if (strpos($url, "'") === 0) {
              $url = trim($url, "'");
            }
            if (strpos($url, "\"") === 0) {
              $url = trim($url, "\"");
            }
            if (stripos($url, "data:") === 0) return "url(" . $url . ")"; //The URL isn't an HTTP URL but is actual binary data. Don't proxify it.
            return "url(" . PROXY_PREFIX . rel2abs($url, $baseURL) . ")";
        },
        $normalizedCSS);
    }
    //Proxify "srcset" attributes (normally associated with <img> tags.)
    function proxifySrcset($srcset, $baseURL) {
      $sources = array_map("trim", explode(",", $srcset)); //Split all contents by comma and trim each value
      $proxifiedSources = array_map(function($source) use ($baseURL) {
        $components = array_map("trim", str_split($source, strrpos($source, " "))); //Split by last space and trim
        $components[0] = PROXY_PREFIX . rel2abs(ltrim($components[0], "/"), $baseURL); //First component of the split source string should be an image URL; proxify it
        return implode($components, " "); //Recombine the components into a single source
      }, $sources);
      $proxifiedSrcset = implode(", ", $proxifiedSources); //Recombine the sources into a single "srcset"
      return $proxifiedSrcset;
    }
    //Extract and sanitize the requested URL, handling cases where forms have been rewritten to point to the proxy.
    if (isset($_POST["miniProxyFormAction"])) {
      $url = $_POST["miniProxyFormAction"];
      unset($_POST["miniProxyFormAction"]);
    } else {
      $queryParams = Array();
      parse_str($_SERVER["QUERY_STRING"], $queryParams);
      //If the miniProxyFormAction field appears in the query string, make $url start with its value, and rebuild the the query string without it.
      if (isset($queryParams["miniProxyFormAction"])) {
        $formAction = $queryParams["miniProxyFormAction"];
        unset($queryParams["miniProxyFormAction"]);
        $url = $formAction . "?" . http_build_query($queryParams);
      } else {
        $url = substr($_SERVER["REQUEST_URI"], strlen($_SERVER["SCRIPT_NAME"]) + 1);
      }
    }
    if (empty($url)) {
        if (empty($startURL)) {
          die("<html><head><title>miniProxy</title></head><body><h1>Welcome to miniProxy!</h1>miniProxy can be directly invoked like this: <a href=\"" . PROXY_PREFIX . $landingExampleURL . "\">" . PROXY_PREFIX . $landingExampleURL . "</a><br /><br />Or, you can simply enter a URL below:<br /><br /><form onsubmit=\"if (document.getElementById('site').value) { window.location.href='" . PROXY_PREFIX . "' + document.getElementById('site').value; return false; } else { window.location.href='" . PROXY_PREFIX . $landingExampleURL . "'; return false; }\" autocomplete=\"off\"><input id=\"site\" type=\"text\" size=\"50\" /><input type=\"submit\" value=\"Proxy It!\" /></form></body></html>");
        } else {
          $url = $startURL;
        }
    } else if (strpos($url, ":/") !== strpos($url, "://")) {
        //Work around the fact that some web servers (e.g. IIS 8.5) change double slashes appearing in the URL to a single slash.
        //See https://github.com/joshdick/miniProxy/pull/14
        $pos = strpos($url, ":/");
        $url = substr_replace($url, "://", $pos, strlen(":/"));
    }
    $scheme = parse_url($url, PHP_URL_SCHEME);
    if (empty($scheme)) {
      //Assume that any supplied URLs starting with // are HTTP URLs.
      if (strpos($url, "//") === 0) {
        $url = "http:" . $url;
      }
    } else if (!preg_match("/^https?$/i", $scheme)) {
        die('Error: Detected a "' . $scheme . '" URL. miniProxy exclusively supports http[s] URLs.');
    }
    //Validate the requested URL against the whitelist.
    $urlIsValid = count($whitelistPatterns) === 0;
    foreach ($whitelistPatterns as $pattern) {
      if (preg_match($pattern, $url)) {
        $urlIsValid = true;
        break;
      }
    }
    if (!$urlIsValid) {
      die("Error: The requested URL was disallowed by the server administrator.");
    }
    $response = makeRequest($url);
    $rawResponseHeaders = $response["headers"];
    $responseBody = $response["body"];
    $responseInfo = $response["responseInfo"];
    //If CURLOPT_FOLLOWLOCATION landed the proxy at a diferent URL than
    //what was requested, explicitly redirect the proxy there.
    $responseURL = $responseInfo["url"];
    if ($responseURL !== $url) {
      header("Location: " . PROXY_PREFIX . $responseURL, true);
      exit(0);
    }
    //A regex that indicates which server response headers should be stripped out of the proxified response.
    $header_blacklist_pattern = "/^Content-Length|^Transfer-Encoding|^Content-Encoding.*gzip/i";
    //cURL can make multiple requests internally (for example, if CURLOPT_FOLLOWLOCATION is enabled), and reports
    //headers for every request it makes. Only proxy the last set of received response headers,
    //corresponding to the final request made by cURL for any given call to makeRequest().
    $responseHeaderBlocks = array_filter(explode("\r\n\r\n", $rawResponseHeaders));
    $lastHeaderBlock = end($responseHeaderBlocks);
    $headerLines = explode("\r\n", $lastHeaderBlock);
    foreach ($headerLines as $header) {
      $header = trim($header);
      if (!preg_match($header_blacklist_pattern, $header)) {
        header($header, false);
      }
    }
    //Prevent robots from indexing proxified pages
    header("X-Robots-Tag: noindex, nofollow", true);
    if ($forceCORS) {
      //This logic is based on code found at: http://stackoverflow.com/a/9866124/278810
      //CORS headers sent below may conflict with CORS headers from the original response,
      //so these headers are sent after the original response headers to ensure their values
      //are the ones that actually end up getting sent to the browser.
      //Explicit [ $replace = true ] is used for these headers even though this is PHP's default behavior.
      //Allow access from any origin.
      header("Access-Control-Allow-Origin: *", true);
      header("Access-Control-Allow-Credentials: true", true);
      //Handle CORS headers received during OPTIONS requests.
      if ($_SERVER["REQUEST_METHOD"] == "OPTIONS") {
        if (isset($_SERVER["HTTP_ACCESS_CONTROL_REQUEST_METHOD"])) {
          header("Access-Control-Allow-Methods: GET, POST, OPTIONS", true);
        }
        if (isset($_SERVER["HTTP_ACCESS_CONTROL_REQUEST_HEADERS"])) {
          header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}", true);
        }
        //No further action is needed for OPTIONS requests.
        exit(0);
      }
    }
    $contentType = "";
    if (isset($responseInfo["content_type"])) $contentType = $responseInfo["content_type"];
    //This is presumably a web page, so attempt to proxify the DOM.
    if (stripos($contentType, "text/html") !== false) {
      //Attempt to normalize character encoding.
      $detectedEncoding = mb_detect_encoding($responseBody, "UTF-8, ISO-8859-1");
      if ($detectedEncoding) {
        $responseBody = mb_convert_encoding($responseBody, "HTML-ENTITIES", $detectedEncoding);
      }
      //Parse the DOM.
      $doc = new DomDocument();
      @$doc->loadHTML($responseBody);
      $xpath = new DOMXPath($doc);
      //Rewrite forms so that their actions point back to the proxy.
      foreach($xpath->query("//form") as $form) {
        $method = $form->getAttribute("method");
        $action = $form->getAttribute("action");
        //If the form doesn't have an action, the action is the page itself.
        //Otherwise, change an existing action to an absolute version.
        $action = empty($action) ? $url : rel2abs($action, $url);
        //Rewrite the form action to point back at the proxy.
        $form->setAttribute("action", rtrim(PROXY_PREFIX, "?"));
        //Add a hidden form field that the proxy can later use to retreive the original form action.
        $actionInput = $doc->createDocumentFragment();
        $actionInput->appendXML('<input type="hidden" name="miniProxyFormAction" value="' . htmlspecialchars($action) . '" />');
        $form->appendChild($actionInput);
      }
      //Proxify <meta> tags with an 'http-equiv="refresh"' attribute.
      foreach ($xpath->query("//meta[@http-equiv]") as $element) {
        if (strcasecmp($element->getAttribute("http-equiv"), "refresh") === 0) {
          $content = $element->getAttribute("content");
          if (!empty($content)) {
            $splitContent = preg_split("/=/", $content);
            if (isset($splitContent[1])) {
              $element->setAttribute("content", $splitContent[0] . "=" . PROXY_PREFIX . rel2abs($splitContent[1], $url));
            }
          }
        }
      }
      //Profixy <style> tags.
      foreach($xpath->query("//style") as $style) {
        $style->nodeValue = proxifyCSS($style->nodeValue, $url);
      }
      //Proxify tags with a "style" attribute.
      foreach ($xpath->query("//*[@style]") as $element) {
        $element->setAttribute("style", proxifyCSS($element->getAttribute("style"), $url));
      }
      //Proxify "srcset" attributes in <img> tags.
      foreach ($xpath->query("//img[@srcset]") as $element) {
        $element->setAttribute("srcset", proxifySrcset($element->getAttribute("srcset"), $url));
      }
      //Proxify any of these attributes appearing in any tag.
      $proxifyAttributes = array("href", "src");
      foreach($proxifyAttributes as $attrName) {
        foreach($xpath->query("//*[@" . $attrName . "]") as $element) { //For every element with the given attribute...
          $attrContent = $element->getAttribute($attrName);
          if ($attrName == "href" && preg_match("/^(about|javascript|magnet|mailto):/i", $attrContent)) continue;
          $attrContent = rel2abs($attrContent, $url);
          $attrContent = PROXY_PREFIX . $attrContent;
          $element->setAttribute($attrName, $attrContent);
        }
      }
      //Attempt to force AJAX requests to be made through the proxy by
      //wrapping window.XMLHttpRequest.prototype.open in order to make
      //all request URLs absolute and point back to the proxy.
      //The rel2abs() JavaScript function serves the same purpose as the server-side one in this file,
      //but is used in the browser to ensure all AJAX request URLs are absolute and not relative.
      //Uses code from these sources:
      //http://stackoverflow.com/questions/7775767/javascript-overriding-xmlhttprequest-open
      //https://gist.github.com/1088850
      //TODO: This is obviously only useful for browsers that use XMLHttpRequest but
      //it's better than nothing.
      $head = $xpath->query("//head")->item(0);
      $body = $xpath->query("//body")->item(0);
      $prependElem = $head != NULL ? $head : $body;
      //Only bother trying to apply this hack if the DOM has a <head> or <body> element;
      //insert some JavaScript at the top of whichever is available first.
      //Protects against cases where the server sends a Content-Type of "text/html" when
      //what's coming back is most likely not actually HTML.
      //TODO: Do this check before attempting to do any sort of DOM parsing?
      if ($prependElem != NULL) {
        $scriptElem = $doc->createElement("script",
          '(function() {
            if (window.XMLHttpRequest) {
              function parseURI(url) {
                var m = String(url).replace(/^\s+|\s+$/g, "").match(/^([^:\/?#]+:)?(\/\/(?:[^:@]*(?::[^:@]*)?@)?(([^:\/?#]*)(?::(\d*))?))?([^?#]*)(\?[^#]*)?(#[\s\S]*)?/);
                // authority = "//" + user + ":" + pass "@" + hostname + ":" port
                return (m ? {
                  href : m[0] || "",
                  protocol : m[1] || "",
                  authority: m[2] || "",
                  host : m[3] || "",
                  hostname : m[4] || "",
                  port : m[5] || "",
                  pathname : m[6] || "",
                  search : m[7] || "",
                  hash : m[8] || ""
                } : null);
              }
              function rel2abs(base, href) { // RFC 3986
                function removeDotSegments(input) {
                  var output = [];
                  input.replace(/^(\.\.?(\/|$))+/, "")
                    .replace(/\/(\.(\/|$))+/g, "/")
                    .replace(/\/\.\.$/, "/../")
                    .replace(/\/?[^\/]*/g, function (p) {
                      if (p === "/..") {
                        output.pop();
                      } else {
                        output.push(p);
                      }
                    });
                  return output.join("").replace(/^\//, input.charAt(0) === "/" ? "/" : "");
                }
                href = parseURI(href || "");
                base = parseURI(base || "");
                return !href || !base ? null : (href.protocol || base.protocol) +
                (href.protocol || href.authority ? href.authority : base.authority) +
                removeDotSegments(href.protocol || href.authority || href.pathname.charAt(0) === "/" ? href.pathname : (href.pathname ? ((base.authority && !base.pathname ? "/" : "") + base.pathname.slice(0, base.pathname.lastIndexOf("/") + 1) + href.pathname) : base.pathname)) +
                (href.protocol || href.authority || href.pathname ? href.search : (href.search || base.search)) +
                href.hash;
              }
              var proxied = window.XMLHttpRequest.prototype.open;
              window.XMLHttpRequest.prototype.open = function() {
                  if (arguments[1] !== null && arguments[1] !== undefined) {
                    var url = arguments[1];
                    url = rel2abs("' . $url . '", url);
                    url = "' . PROXY_PREFIX . '" + url;
                    arguments[1] = url;
                  }
                  return proxied.apply(this, [].slice.call(arguments));
              };
            }
          })();'
        );
        $scriptElem->setAttribute("type", "text/javascript");
        $prependElem->insertBefore($scriptElem, $prependElem->firstChild);
      }
      echo "<!-- Proxified page constructed by miniProxy -->\n" . $doc->saveHTML();
    } else if (stripos($contentType, "text/css") !== false) { //This is CSS, so proxify url() references.
      echo proxifyCSS($responseBody, $url);
    } else { //This isn't a web page or CSS, so serve unmodified through the proxy with the correct headers (images, JavaScript, etc.)
      header("Content-Length: " . strlen($responseBody), true);
      echo $responseBody;
    }
    [/code]

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