LiveCode Forums.

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string var1 = "Foo";
string var2 = "Bar";

ASCIIEncoding encoding = new ASCIIEncoding();
string post = "var1=" + var1 + "&var2=" + var2;
byte[] bites = encoding.GetBytes(post);

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://Url/PageToPostTo.aspx");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = bites.Length;
Stream s = request.GetRequestStream();
s.Write(bites, 0, bites.Length);
s.Close();

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function makeRequest(message,url,responseFunction){
var http_request;
    if (window.XMLHttpRequest){ // Mozilla, Safari,...
    http_request = new XMLHttpRequest();
    if (http_request.overrideMimeType) {
        // set type accordingly to anticipated content type
        //http_request.overrideMimeType('text/xml');
        http_request.overrideMimeType('text/html');
    }
}
else if (window.ActiveXObject){ // IE
    try {
        http_request = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e){
        try {
            http_request = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {}
    }
}

http_request.onreadystatechange = responseFunction;
    http_request.open("POST", url);
http_request.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
http_request.send(message);
}

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set the httpHeaders to "Content-Type: application/x-www-form-urlencoded"

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post myData to URL "http://www.example.net/indications.cgi"
post field "Return Values" to URL field "Current Page"
post tData to URL tMyUrl

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	put "name" into userName
	put "jdoe@example.com" into userPassword
	put "http://" & userName & ":" & URLEncode(userPassword) & "@www.example.net/index.html" into fileURLToGet
	get URL fileURLToGet

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put "name" into userName
put "jdoe@example.com" into userPassword
put "http://" & userName & ":" & URLEncode(userPassword) & "@www.example.net/index.html" into fileURLToGet

set the httpHeaders to "Content-Type: application/x-www-form-urlencoded"   --  ???????

get URL fileURLToGet

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on mouseUp
      put urlEncode(field "username") into tUsername
      put urlEncode(field "rating") into tRating
      put urlEncode(field "comment") into tComment
      put libURLFormData("username", tUsername, "rating", tRating, "comment", tComment) into tDataToBePosted

set the httpHeaders to "Content-Type: application/x-www-form-urlencoded"   --  ???????

      post tDataToBePosted to url (field "urlOfWebForm")
      put it into field "displayResult"
end mouseUp

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on mouseUp
   
   put urlEncode(field "txtUserName") into tUsername
   put urlEncode(field "txtPassword") into tPassword
   
   --put libURLFormData("username", tUsername, "password", tPassword) into tDataToBePosted
   --  username=12345&password=123456
      
   put "username=" & tUserName & "&password=" & tPassword into tDataToBePosted

   put "Post:" & cr & tDataToBePosted & cr & cr   into field txtDisplayResult
   
   set the httpHeaders to "Content-Type: application/x-www-form-urlencoded"   --  ???????
   
   post tDataToBePosted to url ("http://192.168.1.6/lcLoginPost.lc")
   put "Reply:" & cr & it after field "txtDisplayResult"
   
end mouseUp

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<?lc

-- http://localhost/lcGet.lc?company=SanctuarySoftware&state=VIC
-- notice ? delimiter to seperate parameter data from web Address
-- notice & delimiter to seperate one paramater from another

     put "lcLoginPost" & "<br>"
     put "Your Username is:" && $_POST["username"] & "<br>"
     put "Your Password is:" && $_POST["password"] & "<br>"

?>

<?lc
    if $_POST["form_submitted"] is true then
          if $_POST["username"] is "runrev" and $_POST["password"] is "1234" then
              put "You have successfully logged in. Welcome to the super secret area."
          else
          put "Your username and password are incorrect. Please try again."
         end if
    end if
?>

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   put "?username=" & tUserName & "&password=" & tPassword into tDataToBePosted
   put "&form_submitted=true" after tDataToBePosted
   put "Post:" & cr & tDataToBePosted & cr & cr   into field txtDisplayResult
   
   set the httpHeaders to "Content-Type: application/x-www-form-urlencoded"   --  ???????

   put "http://192.168.1.6/lcLoginGet.lc" & tDataToBePosted into x   --works
   get URL x        -- works

   get URL "http://192.168.1.6/lcLoginGet.lc?username=runrev&password=1234&form_submitted=true"  
   -- works

   get URL "http://192.168.1.6/lcLoginGet.lc" & tDataToBePosted  
   -- CONCAT HERE DOES NOT WORK - LC server doesn't recognise parameters.