Some requests never finish

[yspreen]

I used the swift 4.2 pull request.

Whenever a call starts, I print "s URL". For finish "f URL". Here is the output:

"s" "https://storage.googleapis.com/.../n5677twuadpd8sts%26y.jpg"
"s" "https://storage.googleapis.com/.../sr90j5ag7va%2B_owfcz.jpg"
"s" "https://storage.googleapis.com/.../chmtq16rhwcnigo3e6.jpg"
"f" "https://storage.googleapis.com/.../chmtq16rhwcnigo3e6.jpg"
"s" "https://storage.googleapis.com/.../chmtq16rhwcnigo3e6.jpg"
"f" "https://storage.googleapis.com/.../chmtq16rhwcnigo3e6.jpg"
"s" "https://storage.googleapis.com/.../chmtq16rhwcnigo3e6.jpg"
"s" "https://storage.googleapis.com/.../r0e6s2r0tbucbjq4ky.jpg"
"f" "https://storage.googleapis.com/.../r0e6s2r0tbucbjq4ky.jpg"
"s" "https://storage.googleapis.com/.../r0e6s2r0tbucbjq4ky.jpg"
"f" "https://storage.googleapis.com/.../r0e6s2r0tbucbjq4ky.jpg"
"f" "https://storage.googleapis.com/.../chmtq16rhwcnigo3e6.jpg"

some calls, for example the first one, never finish. I'll just use another library, but I thought maybe you'd like to know.