This works:

> (define p (head-impure-port (string->url "http://www.racket-lang.org/";)))
> (read-line p)
"HTTP/1.1 200 OK\r"

But, leaving off trailing /, I usually see

> (define p (head-impure-port (string->url "http://www.racket-lang.org";)))

string-trim: contract violation
  expected: string?
  given: #<eof>

Sometimes I get a port with status line "HTTP/1.1 505 HTTP Version not supported\r".

Can anyone explain? Thanks.

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