[racket] How to reduce my Racket web server's memory usage?

I just bought a DigitalOcean 5$/month VPS with only 512M memory. I started 3 different Racket webserver on different port, and using Nginx as reverse proxy. But I found that each process uses 80M average. I know that it's not a big deal in a machine with 16G memory, but in my VPS I have to merg

[racket] racket/serialize example in The Racket Guide does not work

I followed the guide in http://docs.racket-lang.org/guide/serialization.html‍ > (require racket/serialize) > (serializable-struct posn (x y) #:transparent) > (deserialize (serialize (posn 1 2))) . . dynamic-require: name is not provided name: 'deserialize-info:posn-v0 module: #‍__

[racket] Encoding problem when using smtp-send-message send email to evernote

te entitle encontent) (smtp-send-message (dns-get-address (dns-find-nameserver) "smtp.qq.com") "fy...@foxmail.com" (list EVERMAIL) (standard-message-header "Pentester " (list (string-append "fyooo <" EVERMAIL ">")) '