Esp32 error 400 upload spiffs wav file to web server using http post

[gromero77]

@kenb4

You mean 33KB out of 65KB? Is any data that is present actually correct, but some of it is missing (which parts); or is it all garbled with the wrong bytes? Does the header have the correct lengths after the "RIFF" and "data"? What is the Content-Length that is sent? Is that the complete file length plus the several dozen other bytes that are added?

It will take a little time to put together a multipart stream.

i was recording 5 seconds 160884bytes, the file created on the server have only 32812bytes, some of the data saved are correct.
first lines of the file uploaded>

RIFF$q WAVEfmt    
 
 €>   }
ÿ  data q   ÿ                  û ý þ þ þ þ ý ý 
 þ þ þ ý ý ÿ ÿ         þ þ ý ý   ú ü ü û û û û   ü ü ü ü ü ú ú  ù ú ú ø ø ó ó  ñ ÷ ÷ ÷ ÷ ù ù 	 þ ü ü ü ü ÿ ÿ  ý ù ù õ õ ö ö 
 ü ú ú ÷ ÷ ý ý  ÿ ý ý ü ü ü ü   û ù ù ô ô ö ö  û ø ø ÷ ÷ ú ú 
 ø ÷ ÷ ù ù ø ø þ ô ö ö ø ø ù ù ý ù ÷ ÷ ø ø ù ù ù ø ù ù ù ù ÷ ÷ ÷ õ ö ö ó ó ÷ ÷ õ ÷ ô ô õ õ ö ö õ ÷ ÷ ÷ ö ö ú ú ô þ     ý ý ü ü ñ û û û       í        í 

the content length is calculated with the total body and send it as addheader

@gromero77

// Calculate the content length
  int contentLength = body.length();
  // Set the Content-Length header
  client.addHeader("Content-Length", String(contentLength));