Add explicit no-cache directive for bootstrap updates

This fixes problems with some buggy servers which are returning HTTP 304 response instead of HTTP 200 response even when no cached copy is available with client or when client makes the initial bootstrap request.
K-S-V · Sep 12, 2013 · acf06f1 · acf06f1
1 parent 718f65b
commit acf06f1
Showing 1 changed file with 21 additions and 11 deletions.
diff --git a/AdobeHDS.php b/AdobeHDS.php
@@ -103,7 +103,7 @@ class cURL
       function cURL($cookies = true, $cookie = 'Cookies.txt', $compression = 'gzip', $proxy = '')
         {
           $this->headers     = $this->headers();
-          $this->user_agent  = 'Mozilla/5.0 (Windows NT 5.1; rv:20.0) Gecko/20100101 Firefox/20.0';
+          $this->user_agent  = 'Mozilla/5.0 (Windows NT 5.1; rv:23.0) Gecko/20100101 Firefox/23.0';
           $this->compression = $compression;
           $this->cookies     = $cookies;
           if ($this->cookies == true)
@@ -581,29 +581,36 @@ function ParseManifest($cc, $parentManifest)
           if (isset($this->media['bootstrapUrl']))
             {
               $this->bootstrapUrl = $this->media['bootstrapUrl'];
-              if ($cc->get($this->bootstrapUrl) != 200)
-                  LogError("Failed to get bootstrap info");
-              $bootstrapInfo = $cc->response;
+              $this->UpdateBootstrapInfo($cc, $this->bootstrapUrl);
             }
           else
+            {
               $bootstrapInfo = $this->media['bootstrap'];
-          ReadBoxHeader($bootstrapInfo, $pos, $boxType, $boxSize);
-          if ($boxType == "abst")
-              $this->ParseBootstrapBox($bootstrapInfo, $pos);
-          else
-              LogError("Failed to parse bootstrap info");
+              ReadBoxHeader($bootstrapInfo, $pos, $boxType, $boxSize);
+              if ($boxType == "abst")
+                  $this->ParseBootstrapBox($bootstrapInfo, $pos);
+              else
+                  LogError("Failed to parse bootstrap info");
+            }
         }
 
       function UpdateBootstrapInfo($cc, $bootstrapUrl)
         {
           $fragNum = $this->fragCount;
           $retries = 0;
+
+          // Backup original headers and add no-cache directive for fresh bootstrap info
+          $headers       = $cc->headers;
+          $cc->headers[] = "Cache-Control: no-cache";
+          $cc->headers[] = "Pragma: no-cache";
+
           while (($fragNum == $this->fragCount) and ($retries < 30))
             {
               $bootstrapPos = 0;
               LogDebug("Updating bootstrap info, Available fragments: " . $this->fragCount);
-              if ($cc->get($bootstrapUrl) != 200)
-                  LogError("Failed to refresh bootstrap info");
+              $status = $cc->get($bootstrapUrl);
+              if ($status != 200)
+                  LogError("Failed to refresh bootstrap info, Status: " . $status);
               $bootstrapInfo = $cc->response;
               ReadBoxHeader($bootstrapInfo, $bootstrapPos, $boxType, $boxSize);
               if ($boxType == "abst")
@@ -617,6 +624,9 @@ function UpdateBootstrapInfo($cc, $bootstrapUrl)
                   usleep(4000000);
                 }
             }
+
+          // Restore original headers
+          $cc->headers = $headers;
         }
 
       function ParseBootstrapBox($bootstrapInfo, $pos)