title: SwfUpload returns HTTP error 502
body: <p>I am using SwfUploader. On a couple of test systems, the uploads work OK, on a thrird, it gets error 502.  Is that HTTP error 502 (bad response from gateway) or an swf error? Any tips for tracking this down?</p>
  
  <p>Here is the output from it with the debug flag turned on:</p>
  
  <p>WF DEBUG: ReturnUploadStart(): File accepted by startUpload event and readied for standard upload.  Starting upload to /php/upload.php for File ID: SWFUpload_0_0
  SWF DEBUG: Event: uploadProgress (OPEN): File ID: SWFUpload_0_0
  SWF DEBUG: Event: uploadProgress: File ID: SWFUpload_0_0. Bytes: 4653056. Total: 47326876
  SWF DEBUG: Event: uploadProgress: File ID: SWFUpload_0_0. Bytes: 6062080. Total: 47326876
  SWF DEBUG: Event: uploadProgress: File ID: SWFUpload_0_0. Bytes: 16744448. Total: 47326876
  SWF DEBUG: Event: uploadProgress: File ID: SWFUpload_0_0. Bytes: 24281088. Total: 47326876
  SWF DEBUG: Event: uploadProgress: File ID: SWFUpload_0_0. Bytes: 33128448. Total: 47326876
  SWF DEBUG: Event: uploadProgress: File ID: SWFUpload_0_0. Bytes: 42532864. Total: 47326876
  SWF DEBUG: Event: uploadProgress: File ID: SWFUpload_0_0. Bytes: 47326876. Total: 47326876
  <strong>SWF DEBUG: Event: uploadError: HTTP ERROR : File ID: SWFUpload_0_0. HTTP Status: 502.</strong>
  SWF DEBUG: Event: uploadComplete : Upload cycle complete.
  Error Code: HTTP Error, File name: junk.wmv, Message: 502</p>