Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
ghc-websockets-snap
ghc-websockets-snap(x86-64)
libHSwebsockets-snap-0.10.3.0-6w3fWNPgGwbBZOsHBRnGzO-ghc8.4.3.so()(64bit)

Requires :

libHSHUnit-1.6.0.0-JrvWwD5n0JVL2qYKQOHt3C-ghc8.4.3.so()(64bit)
libHSSHA-1.6.4.4-J97i4k52krALB5u9VxmQ73-ghc8.4.3.so()(64bit)
libHSarray-0.5.2.0-ghc8.4.3.so()(64bit)
libHSasync-2.2.1-1bsiEsDyYvD1Jx6uPPJyV0-ghc8.4.3.so()(64bit)
libHSattoparsec-0.13.2.2-LSyEfPWldu27rWubnW98cS-ghc8.4.3.so()(64bit)
libHSbase-4.11.1.0-ghc8.4.3.so()(64bit)
libHSbase-orphans-0.7-85wcea2rRmdArILlfYz5fz-ghc8.4.3.so()(64bit)
libHSbase64-bytestring-1.0.0.1-4OCIe2BZn8jKI191JIXI37-ghc8.4.3.so()(64bit)
libHSbinary-0.8.5.1-ghc8.4.3.so()(64bit)
libHSblaze-builder-0.4.1.0-Gz7BwSYlOrTDOutVN7e028-ghc8.4.3.so()(64bit)
libHSbytestring-0.10.8.2-ghc8.4.3.so()(64bit)
libHScall-stack-0.1.0-Eiz5FM8yQXpI3vyQ1Rt4Jq-ghc8.4.3.so()(64bit)
libHScase-insensitive-1.2.0.11-LO6zJz9aRiEEtPUvQyaZDw-ghc8.4.3.so()(64bit)
libHSclock-0.7.2-Cf9UTsaN2AjEpBnoMpmgkU-ghc8.4.3.so()(64bit)
libHScontainers-0.5.11.0-ghc8.4.3.so()(64bit)
libHSdeepseq-1.4.3.0-ghc8.4.3.so()(64bit)
libHSdirectory-1.3.1.5-ghc8.4.3.so()(64bit)
libHSentropy-0.4.1.1-FmBdJKRG6hQDsYzBhT7c6v-ghc8.4.3.so()(64bit)
libHSfilepath-1.4.2-ghc8.4.3.so()(64bit)
libHSghc-prim-0.5.2.0-ghc8.4.3.so()(64bit)
libHShashable-1.2.7.0-8MkquYouWwiLIw3HmVGSkN-ghc8.4.3.so()(64bit)
libHSinteger-gmp-1.0.2.0-ghc8.4.3.so()(64bit)
libHSinteger-logarithms-1.0.2.1-KTtq4CBpjpvEUZ9qRz5Dnw-ghc8.4.3.so()(64bit)
libHSio-streams-1.5.0.1-9aHACj0UF9SDV4tMpXqDQZ-ghc8.4.3.so()(64bit)
libHSio-streams-haproxy-1.0.0.2-Gwz8cUDnaW922M2mjsJISN-ghc8.4.3.so()(64bit)
libHSlifted-base-0.2.3.12-8oNRiOXKPA8DfZnRh6i3qM-ghc8.4.3.so()(64bit)
libHSmonad-control-1.0.2.3-EeeHqvyhcVXLIEZuTOhIR1-ghc8.4.3.so()(64bit)
libHSmtl-2.2.2-ghc8.4.3.so()(64bit)
libHSnetwork-2.6.3.6-2g6VId0Xlc85XRtUcfQj0T-ghc8.4.3.so()(64bit)
libHSnetwork-uri-2.6.1.0-AstEwZoXrlUJQq4VkxaVo9-ghc8.4.3.so()(64bit)
libHSold-locale-1.0.0.7-26K7wLFR2jK44UeOklvTCh-ghc8.4.3.so()(64bit)
libHSparsec-3.1.13.0-ghc8.4.3.so()(64bit)
libHSprimitive-0.6.4.0-39Pwmm1zkQX6bM7xFUT3Jc-ghc8.4.3.so()(64bit)
libHSprocess-1.6.3.0-ghc8.4.3.so()(64bit)
libHSrandom-1.1-9LLJAJa4iQFLJiLXBOBXBV-ghc8.4.3.so()(64bit)
libHSreadable-0.3.1-BcSBcf5TfYB2LKDbOZtqGx-ghc8.4.3.so()(64bit)
libHSregex-base-0.93.2-98bD2PeVUkV8MO804tnXmq-ghc8.4.3.so()(64bit)
libHSregex-posix-0.95.2-FLMmMz75XIwP5t3X8eXe-ghc8.4.3.so()(64bit)
libHSscientific-0.3.6.2-2h5PMUpgu6m7FAikNGNQhB-ghc8.4.3.so()(64bit)
libHSsnap-core-1.0.3.2-jGuF2ucmwL8UidKFc7pwy-ghc8.4.3.so()(64bit)
libHSsnap-server-1.1.0.0-KRr9YoBgFSC792c1KNrt0J-ghc8.4.3.so()(64bit)
libHSstm-2.4.5.0-ghc8.4.3.so()(64bit)
libHSstreaming-commons-0.2.1.0-5P6MCU1YyWyFAttn5zFoQE-ghc8.4.3.so()(64bit)
libHStext-1.2.3.0-ghc8.4.3.so()(64bit)
libHStime-1.8.0.2-ghc8.4.3.so()(64bit)
libHStransformers-0.5.5.0-ghc8.4.3.so()(64bit)
libHStransformers-base-0.4.5.2-H2qElSkkJsv7uyyMMnVYVF-ghc8.4.3.so()(64bit)
libHStransformers-compat-0.6.2-EZ0ZvADLUlc4V8RuKaJX5W-ghc8.4.3.so()(64bit)
libHSunix-2.7.2.2-ghc8.4.3.so()(64bit)
libHSunix-compat-0.5.0.1-EHbnKrAgBdbLiFhZ6tM1y-ghc8.4.3.so()(64bit)
libHSunordered-containers-0.2.9.0-IkfpzvG0LzrHAbTzfMidvY-ghc8.4.3.so()(64bit)
libHSvector-0.12.0.1-1fezwShzdEfG3Hp1Pmvjkq-ghc8.4.3.so()(64bit)
libHSwebsockets-0.12.5.1-6FMxoKTOeRlLC21uOC5Hhs-ghc8.4.3.so()(64bit)
libHSzlib-0.6.2-FP80mWgJNoyCiVcPtw6kKj-ghc8.4.3.so()(64bit)
libHSzlib-bindings-0.1.1.5-EndYsqbfXqm5NBek7LJWMz-ghc8.4.3.so()(64bit)
libc.so.6()(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libdl.so.2()(64bit)
libgmp.so.10()(64bit)
libm.so.6()(64bit)
libpthread.so.0()(64bit)
librt.so.1()(64bit)
libutil.so.1()(64bit)
libz.so.1()(64bit)
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1

Content of RPM :
/usr/lib64/ghc-8.4.3/websockets-snap-0.10.3.0-6w3fWNPgGwbBZOsHBRnGzO
/usr/lib64/ghc-8.4.3/websockets-snap-0.10.3.0-6w3fWNPgGwbBZOsHBRnGzO/libHSwebsockets-snap-0.10.3.0-6w3fWNPgGwbBZOsHBRnGzO-ghc8.4.3.so
/usr/share/licenses/ghc-websockets-snap
/usr/share/licenses/ghc-websockets-snap/LICENSE