Write web server benchmarking

[dfellis]

[depombo]

There is some research to be done here to find out what the best practices are for web server benchmarks and then list them here before actually running them.

[cdmistman]

Apache Bench seems to be popular. Here are the Rust web frameworks listed by arewewebyet:

• actix-web (note: gains tokio:1.0 support in the next release of actix-rt
• rocket (note: only available on nightly due to 2 unstable features)
• warp
• ~tide~ no tokio support
• gotham
• ~iron~ seems inactive based on GitHub activity
• ~nickel~ same as above
• ~thruster~ just middleware