I\'m scraping the Madrid Assembly\'s website, built in aspx, and I have no idea how to simulate clicks on the links where I need to get the corresponding politicians from. I
Do agree with ELRuLL - Firebug is your best friend while scraping. If you want to avoid JS simulation then you need reproduce carefully all the params/headers that are being sent.
For example from what I see
for __EVENTTARGET you're sending just
id="ctl00_m_g_36ea0310_893d_4a19_9ed1_88a133d06423_ctl00_Repeater2_ctl01_lnk_Diputado")
and via Firebug we see that:
__EVENTTARGET=ctl00$m$g_36ea0310_893d_4a19_9ed1_88a133d06423$ctl00$Repeater2$ctl01$lnk_Diputado
It maybe the reason and maybe not, just repeat and test.
Firebug link just in case.