Lua

Demonstrates KeepSessionLog and SessionLog

The Chilkat Socket component provides properties for keeping a session log making it possible to see the exact bytes received and sent on a TCP/IP or SSL/TLS connection. To enable session logging, set the KeepSessionLog property = _TRUE_. The SessionLogEncoding property controls how binary, non-printable bytes are represented in the log. There are two possible settings: Possible values are "esc" and "hex". The default value is "esc".

When set to "hex", the bytes are encoded as a hexidecimalized string. The "esc" encoding is a C-string like encoding, and is more compact than hex if most of the data to be logged is text. Printable us-ascii chars are unmodified. Common "C" control chars are represented as "\r", "\n", "\t", etc. Non-printable and byte values greater than 0x80 are escaped using a backslash and hex encoding: \xHH. Certain printable chars are backslashed: SPACE, double-quote, single-quote, etc.

Lua

local chilkat = require("chilkat")

-- This example assumes the Chilkat Socket API to have been previously unlocked.
-- See Socket Unlock Sample for sample code.

local socket = chilkat.Socket.new()

-- Enable session logging:
socket.keep_session_log = true
socket.session_log_encoding = "esc"

local tls = true
local maxWaitMillisec = 20000
local success = socket:connect("www.chilkatsoft.com", 443, tls, maxWaitMillisec)
if not success then
    print(socket.last_error_text)
    return
end

-- Send a GET start line to the web server..
success = socket:send_string("GET /abc123.abc123 HTTP/1.1\r\n")
if not success then
    print(socket.last_error_text)
    return
end

-- Send some bytes that will cause an error...
local binData = chilkat.BinData.new()
binData:append_encoded("01020304", "hex")
success = socket:send_bd(binData, 0, 0)

-- Read the response up to the first double CRLF:
local httpHeader = socket:receive_until_match("\r\n\r\n")
if not socket.last_method_success then
    print(socket.last_error_text)
    return
end

-- Close the connection with the server
-- Wait a max of 20 seconds (20000 millsec)
socket:close(20000)

-- Display the session log:
print(socket.session_log)

-- The Session log will show the exact bytes sent and received.
-- In this case, the session log shows:

--     SendString: GET\x20/abc123.abc123\x20HTTP/1.1\r\n
--
--     SendBytes: \x01\x02\x03\x04
--     ReceiveUntilMatch: HTTP/1.1\x20400\x20Bad\x20Request\r\n
--         Content-Type:\x20text/html;\x20charset=us-ascii\r\n
--         Server:\x20Microsoft-HTTPAPI/2.0\r\n
--         Date:\x20Thu,\x2027\x20Oct\x202016\x2013:16:02\x20GMT\r\n
--         Connection:\x20close\r\n
--         Content-Length:\x20339\r\n
--         \r\n
--         <!DOCTYPE\x20HTML\x20PUBLIC\x20\"-//W3C//DTD\x20HTML\x204.01//EN\"\"http://www.w
--         3.org/TR/html4/strict.dtd\">\r\n
--         <HTML><HEAD><TITLE>Bad\x20Request</TITLE>\r\n
--         <META\x20HTTP-EQUIV=\"Content-Type\"\x20Content=\"text/html;\x20charset=us-ascii
--         \"></HEAD>\r\n
--         <BODY><h2>Bad\x20Request\x20-\x20Invalid\x20Header</h2>\r\n
--         <hr><p>HTTP\x20Error\x20400.\x20The\x20request\x20has\x20an\x20invalid\x20header
--         \x20name.</p>\r\n
--         </BODY></HTML>\r\n
--