__VIEWSTATE encoding

TI was tapping my browser POST messages to a calendar, and noticed that the first message has an uncoded __VIEWSTATE, while the next messages seem to have it encoded (See bellow). How can a web server know that if a message has its __VIEWSTATE encoded or not? Because I didn't find anything in the headers about it. Would it be that a encoded message starts with "%2F", and an uncoded one not? Is there a RFC about it, if so which one?

Thanks,

Andre


*** FIRST MESSAGE ***

POST /HelpDesk/Default.aspx HTTP/1.1
Host: 192.168.35.21
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.11) Gecko/20071128 Iceweasel/2.0.0.11 (Debian-2.0.0.11-1)
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Referer: http://192.168.35.21/HelpDesk/
Content-Length: 12407
Pragma: no-cache
Cache-Control: no-cache

__EVENTTARGET=RadCalendar1&__EVENTARGUMENT=d&__VIEWSTATE=0000WAUHA5F1L&RadMenu1=&RadToolbar1_Hidden=Horizontal%23new%2C1%2C0%2C0%23Send%2C1%2C0%2C0%23Save%2C1%2C0%2C0&RadToolbar1$Radtoolbartemplatebutton1$ctl00$RadCombobox_Input=&RadToolbar1$Radtoolbartemplatebutton1$ctl00$RadCombobox_text=&RadToolbar1$Radtoolbartemplatebutton1$ctl00$RadCombobox_value=&RadToolbar1$Radtoolbartemplatebutton1$ctl00$RadCombobox_index=-1&RadToolbar1$Radtoolbartemplatebutton1$ctl00$RadCombobox_clientWidth=203px&RadToolbar1$Radtoolbartemplatebutton1$ctl00$RadCombobox_clientHeight=22px&RadTreeView1_expanded=10000000000000000000000000000000000000000000000000000000000000000000&RadTreeView1_checked=00000000000000000000000000000000000000000000000000000000000000000000&RadTreeView1_selected=01000000000000000000000000000000000000000000000000000000000000000000&RadTreeView1_scroll=0&RadTreeView1_viewstate=0&RadPaneTV=%7B%22originalWidth%22%3A%22263px%22%2C%22originalHeight%22%3A%22%22%2
C%22width%22%3A263%2C%22height%22%3A525%2C%22collapsed%22%3Afalse%2C%22collapsedDirection%22%3A1%2C%22scrollLeft%22%3A0%2C%22scrollTop%22%3A0%2C%22expandedSize%22%3A0%2C%22contentUrl%22%3A%22%22%2C%22minWidth%22%3A20%2C%22maxWidth%22%3A2147483647%2C%22minHeight%22%3A20%2C%22maxHeight%22%3A2147483647%2C%22locked%22%3Afalse%7D&RadCalendar1_SD=%5B%5B2006%2

*** SECOND MESSAGE ***

POST /HelpDesk/Default.aspx HTTP/1.1
Host: 192.168.35.21
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.11) Gecko/20071128 Iceweasel/2.0.0.11 (Debian-2.0.0.11-1)
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Referer: http://192.168.35.21/HelpDesk/
Content-Length: 33015
Pragma: no-cache
Cache-Control: no-cache

__EVENTTARGET=RadCalendar1&__EVENTARGUMENT=d&__VIEWSTATE=%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
TWVudWQUKwAMFCsAAg8WBh8BBQRVbmRvHwIFBFVuZG8fAwUOSW1nLzIxdW5kby5naWZkZBQrAAIPFgYfAQUEUmVkbx8CBQRSZWRvHwMFDkltZy8yMnJlZG8uZ2lmZGQUKwACDxYEHwMFEUltZy9zZXBhcmF0b3IuZ2lmHwRnFgQfBQUDMTcwHwYFATFkFCsAAg8WBh8BBQNDdXQfAgUDQ3V0HwMFDUltZy8yM2N1dC5naWZkZBQrAAIPFgYfAQUEQ29weR8CBQRDb3B5HwMFDkltZy8yNGNvcHkuZ2lmZGQUKwACDxYGHwEFBVBhc3RlHwIFBVBhc3RlHwMFD0ltZy8yNXBhc3RlLmd





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Received on Sunday, 23 March 2008 20:54:48 UTC