Duplicate headers received from server

Question

Duplicate headers received from server The response from the server contained duplicate headers  This problem is generally the result of a misconfigured website or proxy  Only the website or proxy administrator can fix this issue  Error 349  net  ERR RESPONSE HEADERS MULTIPLE CONTENT DISPOSITION   Multiple distinct Content-Disposition headers received  This is disallowed to protect against HTTP response splitting attacks   I found this error while exporting to pdf in chrome  Response Buffer   false  Response ClearHeaders    string ext   objProp PACKAGEFILENAME Substring objProp PACKAGEFILENAME LastIndexOf  quot   quot     string ext1   ext Substring 1   Response ContentType   ext1  Response AddHeader  quot Content-Disposition quot    quot target  blank attachment  filename  quot    objProp PACKAGEFILENAME   const int ChunkSize   1024  byte   binary   objProp PACKAGEDOCUMENT  System IO MemoryStream ms   new System IO MemoryStream binary   int SizeToWrite   ChunkSize   for  int i   0  i  lt  binary GetUpperBound 0  - 1  i   i   ChunkSize        if   Response IsClientConnected  return      if  i   ChunkSize  gt   binary Length  SizeToWrite   binary Length - i      byte   chunk   new byte SizeToWrite       ms Read chunk  0  SizeToWrite       Response BinaryWrite chunk       Response Flush      Response Close     How to fix this

User · Answer

Double quotes around the filename in the header is the standard per MDN web docs   Omitting the quotes creates multiple opportunities for problems arising from characters in the filename

User · Answer

The server SHOULD put double quotes around the filename  as mentioned by  cusman and  Touko in their replies   For example   Response AddHeader  Content-Disposition    attachment filename       filename

User · Answer

This ones a little old but was high in the google ranking so I thought I would throw in the answer I found from Chrome  pdf display  Duplicate headers received from the server  Basically my problem also was that the filename contained commas   Do a replace on commas to remove them and you should be fine   My function to make a valid filename is below       public static string MakeValidFileName string name                string invalidChars   Regex Escape new string System IO Path GetInvalidFileNameChars              string invalidReStr   string Format     0      invalidChars           string replace   Regex Replace name  invalidReStr       Replace          Replace                   return replace

User · Answer

Just put a pair of double quotes around your file name like this   this Response AddHeader  Content-disposition     attachment  filename    outputFileName

User · Answer

For me the issue was about a comma not in the filename but as below  -  Response ok streamingOutput MediaType APPLICATION OCTET STREAM TYPE  header  content-disposition    attachment  filename your file name   build     I accidentally put a comma after attachment  Got it resolved by replacing comma with a semicolon

[google-chrome] Duplicate headers received from server

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