Berlin substitute server "Bad Read-Header-Line header: #<eof>

[Leo Famulari]

Most of the substitutes I am requesting from <berlin.guixsd.org> are
failing as shown below. Using --fallback does work.

$ guix build --no-grafts address@hidden
276.7 MB will be downloaded:
   /gnu/store/zgdbdy1f9ki5v230qkkzs2kzk88wdgqd-go-1.11.1-doc
   /gnu/store/hic1m8z5ha07bk1hz7qlq38z1h5bnlki-go-1.11.1
   /gnu/store/i1zh8fljz9lbf0335lmadmqlzayd5v58-go-1.11.1-tests
substituting /gnu/store/hic1m8z5ha07bk1hz7qlq38z1h5bnlki-go-1.11.1...
Backtrace:
           3 (apply-smob/1 #<catch-closure 1591640>)
In ice-9/boot-9.scm:
    705:2  2 (call-with-prompt _ _ #<procedure default-prompt-handle…>)
In ice-9/eval.scm:
    619:8  1 (_ #(#(#<directory (guile-user) 1614140>)))
In guix/ui.scm:
  1583:12  0 (run-guix-command _ . _)

guix/ui.scm:1583:12: In procedure run-guix-command:
Bad Read-Header-Line header: #<eof>

substitution of /gnu/store/hic1m8z5ha07bk1hz7qlq38z1h5bnlki-go-1.11.1 failed
substituting /gnu/store/zgdbdy1f9ki5v230qkkzs2kzk88wdgqd-go-1.11.1-doc...
killing process 6597
killing process 6597: No such process
guix build: error: build failed: some substitutes for the outputs of derivation 
`/gnu/store/594mjalsqpf5r1kcjh312mg9nlnsicxf-go-1.11.1.drv' failed (usually 
happens due to networking issues); try `--fallback' to build derivation from 
source

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