Backend: apply custom initial HTTP2 SETTINGS frame to Chrome browser …

…fingerprints (closes #11)
sleeyax · Jun 3, 2023 · 68815dc · 68815dc
1 parent f2c9238
commit 68815dc
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Showing 3 changed files with 14 additions and 3 deletions.
diff --git a/src-go/server/go.mod b/src-go/server/go.mod
@@ -17,4 +17,4 @@ require (
 	golang.org/x/text v0.9.0 // indirect
 )
 
-replace github.com/ooni/oohttp => github.com/sleeyax/oohttp v0.0.0-20230603093000-5878d39f799b
+replace github.com/ooni/oohttp => github.com/sleeyax/oohttp v0.0.0-20230603105812-6ac0447b1a8e
diff --git a/src-go/server/go.sum b/src-go/server/go.sum
@@ -6,8 +6,8 @@ github.com/klauspost/compress v1.15.15 h1:EF27CXIuDsYJ6mmvtBRlEuB2UVOqHG1tAXgZ7y
 github.com/klauspost/compress v1.15.15/go.mod h1:ZcK2JAFqKOpnBlxcLsJzYfrS9X1akm9fHZNnD9+Vo/4=
 github.com/refraction-networking/utls v1.3.2 h1:o+AkWB57mkcoW36ET7uJ002CpBWHu0KPxi6vzxvPnv8=
 github.com/refraction-networking/utls v1.3.2/go.mod h1:fmoaOww2bxzzEpIKOebIsnBvjQpqP7L2vcm/9KUfm/E=
-github.com/sleeyax/oohttp v0.0.0-20230603093000-5878d39f799b h1:p8IFdGGVs/v7zW/rYB/A9jT1GFfjIbewbcN+KpcfCAs=
-github.com/sleeyax/oohttp v0.0.0-20230603093000-5878d39f799b/go.mod h1:/7fPgmXNkMSXBpLOdARkhyn3vsNAtmZ0C3G5C/KLd6Q=
+github.com/sleeyax/oohttp v0.0.0-20230603105812-6ac0447b1a8e h1:evx5O2TAZdPLDCqPuEI5yo4Sg3LT5cImPVbno6HKM2s=
+github.com/sleeyax/oohttp v0.0.0-20230603105812-6ac0447b1a8e/go.mod h1:/7fPgmXNkMSXBpLOdARkhyn3vsNAtmZ0C3G5C/KLd6Q=
 golang.org/x/crypto v0.5.0 h1:U/0M97KRkSFvyD/3FSmdP5W5swImpNgle/EHFhOsQPE=
 golang.org/x/crypto v0.5.0/go.mod h1:NK/OQwhpMQP3MwtdjgLlYHnH9ebylxKWv3e0fK+mkQU=
 golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=

diff --git a/src-go/server/internal/transport.go b/src-go/server/internal/transport.go
@@ -89,6 +89,17 @@ func NewTransport(config *TransportConfig) *oohttp.StdlibTransport {
 		TLSClientFactory:      tlsFactory.NewUTLSConn,
 	}
 
+	// add realistic initial HTTP2 SETTINGS to Chrome browser fingerprints
+	if strings.HasPrefix(string(config.Fingerprint), "Chrome") {
+		transport.EnableCustomInitialSettings()
+		transport.HeaderTableSize = 65536
+		transport.EnablePush = 0
+		transport.MaxConcurrentStreams = 1000
+		transport.InitialWindowSize = 6291456
+		transport.MaxFrameSize = 16384
+		transport.MaxHeaderListSize = 262144
+	}
+
 	if config.IdleConnTimeout != 0 {
 		transport.IdleConnTimeout = time.Duration(config.IdleConnTimeout) * time.Second
 	}