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Possible race condition with http2

See original GitHub issue

I haven’t looked into this yet, but am seeing different behaviour for the same operation

$ okcurl --frames https://graph.facebook.com/robots.txt
<< 0x00000000    30 SETTINGS      
<< 0x00000000     4 WINDOW_UPDATE 
>> CONNECTION 505249202a20485454502f322e300d0a0d0a534d0d0a0d0a
>> 0x00000000     0 SETTINGS      ACK
>> 0x00000000     6 SETTINGS      
>> 0x00000000     4 WINDOW_UPDATE 
>> 0x00000003    76 HEADERS       END_STREAM|END_HEADERS
<< 0x00000000     0 SETTINGS      ACK
<< 0x00000003     4 WINDOW_UPDATE 
<< 0x00000003   174 HEADERS       END_HEADERS
<< 0x00000003    26 DATA          END_STREAM
User-agent: *
Disallow: /
>> 0x00000000     8 GOAWAY

$ okcurl --frames https://graph.facebook.com/robots.txt
<< 0x00000000    30 SETTINGS      
>> 0x00000000     0 SETTINGS      ACK
<< 0x00000000     4 WINDOW_UPDATE 
>> CONNECTION 505249202a20485454502f322e300d0a0d0a534d0d0a0d0a
>> 0x00000000     6 SETTINGS      
>> 0x00000000     4 WINDOW_UPDATE 
>> 0x00000003    76 HEADERS       END_STREAM|END_HEADERS
<< 0x00000000    34 GOAWAY        
>> CONNECTION 505249202a20485454502f322e300d0a0d0a534d0d0a0d0a
<< 0x00000000    30 SETTINGS      
<< 0x00000000     4 WINDOW_UPDATE 
>> 0x00000000     0 SETTINGS      ACK
>> 0x00000000     6 SETTINGS      
>> 0x00000000     4 WINDOW_UPDATE 
>> 0x00000003    76 HEADERS       END_STREAM|END_HEADERS
<< 0x00000000     0 SETTINGS      ACK
<< 0x00000003     4 WINDOW_UPDATE 
<< 0x00000003   172 HEADERS       END_HEADERS
<< 0x00000003    26 DATA          END_STREAM
User-agent: *
Disallow: /
>> 0x00000000     8 GOAWAY