[paul.fr]

If spider webs are mainly made out of protein, does that make them edible? Not that i would want to eat one myself, but here is a web that could fill you up!

[another_someone]

Don't forget that ricin is a protein also - not all proteins are so nutritious.

[Monox D. I-Fly]

If spider webs are mainly made out of protein, does that make them edible? Not that i would want to eat one myself, but here is a web that could fill you up!

Ummm... Some days ago I read an encyclopedia that says that the liquid to make spider webs is actually its sperm... And sperms are made out of protein too... Ugh, I must stop before I break any rules...

[chris]

No spider webs are not made from sperm. Sperms are living cells. Webs are made from proteins, which are polymer molecules and orders of magnitude smaller than sperm cells.

[evan_au]

Are spider webs edible for spiders?

Apparently some spiders eat their own web and respin it, every day.
Recycling in action!
See: https://en.wikipedia.org/wiki/Spider_web#Silk_production [Links inactive - To make links active and clickable, login or click here to register]
A video of a spider taking down its web (and eating it):

[Villi]

The protein can be broken down in our stomach's acid.