AJAX post error Refused to set unsafe header Connection

Question

I have the following custom ajax function that posts data back to a PHP file  Everytime the post of data happens I get the following two errors        Refused to set unsafe header  Content-length    Refused to set unsafe header  Connection    Code     function passposturl url1  params  obj          url1   url1   amp sid   Math random        xmlHttp   get xmlhttp obj        xmlHttp loadflag   obj      xmlHttp open  POST   url1  true         alert url1         alert params         alert obj         alert params length       xmlHttp setRequestHeader  Content-type    application x-www-form-urlencoded        xmlHttp setRequestHeader  Content-length   params length       xmlHttp setRequestHeader  Connection    close        xmlHttp onreadystatechange   function                  stateChanged xmlHttp              xmlHttp send params        What am I doing wrong

User · Accepted Answer

Remove these two lines   xmlHttp setRequestHeader  Content-length   params length   xmlHttp setRequestHeader  Connection    close      XMLHttpRequest isn t allowed to set these headers  they are being set automatically by the browser  The reason is that by manipulating these headers you might be able to trick the server into accepting a second request through the same connection  one that wouldn t go through the usual security checks - that would be a security vulnerability in the browser

[javascript] AJAX post error : Refused to set unsafe header "Connection"

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