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http = CreateHTTPConnection()
SetHTTPHost( http, "www.thegamecreators.com", 0 )

SendHTTPRequestASync( http, "agktest/posttest.php", "myvar=5" )
while GetHTTPResponseReady(http) = 0
    Print( "Connecting..." )
    Sync()
endwhile

response$ = GetHTTPResponse(http)

CloseHTTPConnection(http)
DeleteHTTPConnection(http)

// main loop
do
    Print( "Server response: " + response$ )
    Sync()
loop

// The PHP server code accesses the "myvar" value like this
// $value = (int) $_POST['myvar'];                

Example by James C (AGK version: 108.24)
Submitted: 2014-09-08 13:10:21

Note: This command is not truly A-Synchronous, in the sense that multiple requests can be send and received A-Synchronously. Rather, it is a single threaded implementation of the regular SendHTTPRequest, which allows you to continue the Sync() loop to update your animations and other screen related functions, while waiting for an answer to arrive. Upon arrival that answer should be processed with GetHTTPResponse, before a new request can be send. Another important detail is that GetHTTPResponseReady will keep on returning true (1), until a new request has been sent. 

Attached is an example that will show how this works:

rem
rem AGK Application
rem

#constant NO 0
#constant YES 1

http = CreateHTTPConnection()
SetHTTPHost( http, "your_web_site", 0 )

// The server will just reply with the string that was sendtto it
dim request[4] as string = ["C", "Q", "b", "A"] 
dim response[4] as string = ["", "", "", ""]
dim txn[4, 2] as float  // 4 requests and 4 responses
for i = 0 to 3
    for j = 0 to 1
        txn[i, j] = 0.0
    next j
next i

jumptab = 0

// the way I use these variables is:
// if they are equal, I can send a new request, since I received an answer
// if unequal, I'm waiting for an answer. (Fail is an answer too)
send_counter     = 0
response_counter = 0

do
    print( str(jumptab) )
    for t = 0 to 3
        Print( "Sent request " + str(t) + " with data <" + request[t] + "> at timer: " + str(txn[t, 0]) )
        Print( "Recv request " + str(t) + " with data <" + response[t] + "> at timer: " + str(txn[t, 1]) )
    next t
    
    tim# = timer()

    if send_counter = response_counter
        SendHTTPRequestASync( http, "app_dummy_if.php", "action=" + request[send_counter] )
        txn[send_counter, 0] = tim#
        inc send_counter
    endif

    my_status = GetHTTPResponseReady(http)
    if my_status <> 0 AND response_counter < 4  // 0 means, still going
        if my_status = -1                       // -1 means failed
            response[ response_counter ] = "failed"
            inc response_counter
        else           // 1 means success, so find what we got back from server
            response[ response_counter ] = GetHTTPResponse(http)
        endif
        txn[ response_counter , 1 ] = tim#
        inc response_counter
    endif

    if getrawkeypressed(27) = YES then end
    Sync()
    inc jumptab
loop