Nortel Web OS 10.0, Application Manual

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Web OS 10.0 Application Guide
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Chapter 10: Health Checking
212777-A, February 2002
Script Format
The general format for health-check scripts is shown below:
N
OTE
– If you are doing HTTP 1.1 pipelining, you need to individually open and close each
response in the script.
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Each script should start with the command
open port
<protocol port number>. The
next line can be either a
send
or
expect
.
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The first word is the method. This is usually
get
; however, HTTP supports several other
commands, including
put
and
head
. The second word indicates the content desired, or
request-URI, and the third word represents the version of the protocol used by the client.
If you supplied HTTP/1.1 for the protocol version, you would also have to add in the fol-
lowing line:
Host: www.hostname.com
Example:
GET /index.html HTTP/1.1
(press Enter key)
Host: www.hostname.com
(press Enter key twice)
This is known as a host header. It is important to include because most Web sites now
require it for proper processing. Host headers were optional in HTTP/1.0 but are required
when you use HTTP/1.1+.
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In order to tell the Web server you have finished entering header information, a blank line
of input is needed after all headers. At this point, the URL will be processed and the
results returned to you.
N
OTE
–
If you make an error, enter rem to remove the last typed script line entered. If you
need to remove more than one line, enter rem for each line that needs to be removed.
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The switch provides the “\” prompt, which is one enter key stroke. When using the
send
command, note what happens when you type the send command with the command
string. When you type
send
, press enter and allow the switch to format the command
string (that is, \ versus \\).
open
application_port (e.g., 80 for HTTP, 23 for Telnet, etc.)
send
request1
expect response1
send
request2
expect response2
send
request3
expect
response3
close