Re: http server protocol

Using IP Sniffer http://erwan.l.free.fr/ I found the Windows Hyperterminal
serial terminal was converting CR/LF to CR only. The browser needs CR/LF
pairs in the HTML data or it ignores it. So I set HyperTerminal to send
CR/LF pairs, but my browser received and displayed raw HTML. I then found a
single LF character was appearing before the HTML header "HTTP/1.1 200 OK"
in the reply data sent to the client browser.

The final solution is to turn on or off CR/LF in HyperTerminal depending on
whether I am typing commands to SocketEthernetIP or pasting the HTML data
into HyperTerminal. The problem was caused by the serial terminal software.

"Garrick" <sitongia@xxxxxxxxxxx> wrote in message
news:4MidnV0X_LHG09nYnZ2dnUVZ_r2dnZ2d@xxxxxxxxxxxxxxxxxx
UPDATE: The terminal was not sending the line-feeds with the carriage
returns. With that turned on and fixed, I send the following text to the
browser, flush the socket and I have to close it in order for the browser
to
display, but it then displays everything raw:

HTTP/1.1 200 OKContent-type: text/html
<html><head> <meta content="text/html; charset=ISO-8859-1"
http-equiv="content-type">
<title>test</title></head><body>test</body></html>
Someone told me that the TCP connection was probably expecting an End of
Data signal, which I don't know how to send.

Garrick

"Garrick" <sitongia@xxxxxxxxxxx> wrote in message
news:J-2dnWIlEL7cR97YnZ2dnUVZ_sGdnZ2d@xxxxxxxxxxxxxxxxxx
This isn't specifically a Linux networking question, but I hope somebody
will help because this is a device that will be used with Linux.

I am using a ethernet embedded module


(SocketEthernetIP)(http://www.multitech.com/PRODUCTS/Families/SocketEthernet
IP/
in raw TCP/IP mode as part of a embedded webserver for a product that
will
access the Internet.

The ethernet side of SocketEthernetIP is set it up to have an open TCP
port
(3000), and is connected to the LAN, 192.168.0.123

I have Windows Hyperterminal serial terminal connected to the serial
port
side of the SocketEthernetIP.

On my client PC, in the webbrowser I contact it
http://192.168.0.123:3000


The browser GET command is received by SocketEthernetIP, as it appears
in
the output of the serial port which is connected to the serial terminal.
When SocketEthernetIP recieves the HTTP GET request, it assignes a
socket
handle which is associated with the socket of the web browser.

Using the serial terminal, I send an HTTP reply to the client web
browser,
using the socket handle, the reply:

HTTP/1.1 200 OK
Content-type: text/html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="content-type">
<title>test</title>
</head>
<body>
test
</body>
</html>

SocketEthernetIP module wraps it into the TCP packet and sends it to my
webbrowser over the LAN, but it the web browser doesn't seem to get it,
it
is still waiting for a response. I tried using a packet sniffer IE
Inspector
which show the sent HTTP actually is being received by the PC, and it is
associated with the correct socket destination.

But the web browser doesn't acknowledge it. I tried closing the all TCP
sockets from SocketEthernetIP, but that didn't cause the browser to load
the
sent HTTP response.

Is there something I am not doing here?

Thanks.







.

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