GRPC through F5 Virtual Server [RST_STREAM with error code: INTERNAL_ERROR]

JRahm 

Thank you for response 

Here what I got when I run nghttp 

nghttp -ynv https://thanos-query-k8s-web-pp.com
[ 0.012] Connected
The negotiated protocol: h2
[ 0.079] recv SETTINGS frame <length=18, flags=0x00, stream_id=0>
(niv=3)
[SETTINGS_MAX_CONCURRENT_STREAMS(0x03):10]
[SETTINGS_INITIAL_WINDOW_SIZE(0x04):32768]
[SETTINGS_MAX_HEADER_LIST_SIZE(0x06):32768]
[ 0.079] send SETTINGS frame <length=12, flags=0x00, stream_id=0>
(niv=2)
[SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
[SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
[ 0.079] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
; ACK
(niv=0)
[ 0.079] send PRIORITY frame <length=5, flags=0x00, stream_id=3>
(dep_stream_id=0, weight=201, exclusive=0)
[ 0.079] send PRIORITY frame <length=5, flags=0x00, stream_id=5>
(dep_stream_id=0, weight=101, exclusive=0)
[ 0.079] send PRIORITY frame <length=5, flags=0x00, stream_id=7>
(dep_stream_id=0, weight=1, exclusive=0)
[ 0.079] send PRIORITY frame <length=5, flags=0x00, stream_id=9>
(dep_stream_id=7, weight=1, exclusive=0)
[ 0.079] send PRIORITY frame <length=5, flags=0x00, stream_id=11>
(dep_stream_id=3, weight=1, exclusive=0)
[ 0.079] send HEADERS frame <length=52, flags=0x25, stream_id=13>
; END_STREAM | END_HEADERS | PRIORITY
(padlen=0, dep_stream_id=11, weight=16, exclusive=0)
; Open new stream
:method: GET
:path: /
:scheme: https
:authority: thanos-query-k8s-web-pp.com
accept: */*
accept-encoding: gzip, deflate
user-agent: nghttp2/1.40.0
[ 0.090] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
; ACK
(niv=0)
[ 4.092] recv RST_STREAM frame <length=4, flags=0x00, stream_id=13>
(error_code=INTERNAL_ERROR(0x02))
[ 4.092] send GOAWAY frame <length=8, flags=0x00, stream_id=0>
(last_stream_id=0, error_code=NO_ERROR(0x00), opaque_data(0)=[])
Some requests were not processed. total=1, processed=0

For the tcpdump, unfortunately I don't have access to the virtual server right now. will check it once I have it. 

Thanks!