Add response size (bytes) to view about cui

[jootd]

Hi, I have question about this issue . Is it right that response size in bytes is
body, err := ioutil.ReadAll(res.Body)
len(body) // <----

[mfinelli]

len(body) is probably good enough. In theory we could also read a Content-Length header if it exists, but not all webservers or response types will send that header so I think it's better to just read the actual size of the body once we have the whole thing.

[mfinelli]

Resolved in fd4d5e4