Detecting broken link: Multipart mimetype - XMLHttpRequest()

[Wilfred Nilsen]

I have tested the new multipart/x-mixed-replace feature of the 
XMLHttpRequest object. I have a small servlet pushing data to the client 
and I have the client print out data from all the XMLHttpRequest event 
functions.

This is the typical sequence:
onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 0
The onreadystatechange is called 4 times and then the onload handler is 
called with the data. The server sends up a simple text message to the 
client.

I need to detect if the persistent connection disconnects abruptly. I 
tested this by terminating the server and I got the following from the 
event functions:

onreadystatechange : 1
onreadystatechange : 4, status=200
The question is:
can one assume the server connection broke if the onreadystatechange 
event function does not get the 1,2,3,4 sequence?  i.e. can one assume 
the connection broke if one get the sequence 1,4 as above?

Here is my simple log from the server. The last entry is when I 
terminate the server.

onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 0
onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 1
onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 2
onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 3
onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 4
onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 5
onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 6
onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 7
onreadystatechange : 1
onreadystatechange : 2
onreadystatechange : 3
onreadystatechange : 4, status=200
onload : Hi from server 8
onreadystatechange : 1
onreadystatechange : 4, status=200
Thanks,
-Wilfred
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