Release 1.5.2

• Expose ConnectivityState of a ClientConn. (#1385)
• Enabling client process multiple GoAways (#1393)
• Server should send 2 goaway messages to gracefully shutdown the connection. (#1403)
• Set peer before sending request (#1423)
• Add and use connectivity package for states (#1430)

Release 1.5.1

• Do not create new addrConn when connection error happens (#1369)

Release 1.5.0

Performance

• BDP estimation and window update. (#1310)
• Do not flush NewStream header on client side for unary RPCs and streaming RPCs with requests. (#1343)
• Change objects in recvBuffer queue from interface to concrete type to reduce allocs (#1029)
• Don't create new reader in recvMsg (#940)

API change

• Add support for grpc.SupportPackageIsVersion3 back (#1331)
• Add Severity and VerboseLevel to grpclog. (#922)

Behavior change

• Transport errors should be coded Unavailable instead of internal. (#1307)
• Catch invalid use of Server.RegisterService after Register.Serve (#828)

Bug fixes

• Fix deadlock of roundrobin balancer (#1353)
• Use log severity and verbosity level (#1340)
• Protect bytesSent and bytesReceived with mutex to avoid datarace (#1318)
• Support IPv6 addresses in grpclb (#1303)
• Return header in Stream.Header() if available (#1281)
• Fix error handling on Stream deletion (#1275)

Documentation

• Add documentation to deprecate WithTimeout dial option (#1333)
• Specify characters allowed in metadata keys (#1299)
• Update LICENSE to Apache 2 (#1290)
• Update the path of guide (#950)

Testing

• latency: sleep in Write when BDP is exceeded to avoid buffer bloat (#1330)
• Replace 127.0.0.1 with localhost for ipv6 only environment (#1306)
• Create latency package for realistically simulating network latency (#1286)
• Use subtests for the benchmark_test and add it into the Makefile (#1278)

Release 1.4.2

• Protect bytesSent and bytesReceived with mutex to avoid datarace (#1318)

Release 1.4.1

• transport: fix error handling on Stream deletion (#1275)

Release 1.4.0

New features

• Implement EmptyCallOption (#1244)
• Adding dial options for PerRPCCredentials (#1225)
• Expand service config support (#1165)

Performance

• Piggyback window updates for connection with those of a stream. (#1273)
• Decouple transport flow control from application read. (#1265)
• Expand stream's flow control in case of an active read. (#1248)
• Eagerly set a pointer to nil to help GC (#1232)
• Use pooled gzip.{Writer,Reader} in gzip{Compressor,Decompressor} (#1217)
• Make window size configurable. (#1210)

Bug fixes

• Server shouldn't Fatalf in case it fails to encode. (#1276)
• Avoid uint32 overflow when applying initial window size setting (#1268)
• Initialize stream properly in handler_server. (#1260)
• Avoid panic caused by stdlib context package errors (#1258)
• grpclb balancer.Close() should not panic if called more than once (#1250)
• Reuse Token for serviceAccount credentials (#1238)
• add logs to grpclb on send and recv (#1235)
• Calling handleRPC with context derived from the original (#1227)
• Reset proto before unmarshalling (#1222)
• don't add defer func if stats handler is nil (#1214)
• Fix go buildable source file problem (#1213)
• Pass custom dialer to balancer (#1205)
• Fix http status code to grpc status conversion (#1195)
• make ServerOption panic messages more clear. (#1194)
• Log the actual error when inTapHandle fails in http2Server (#1185)
• tentative fix to a flow control over-give-back bug (#1170)
• Add stats test for client streaming and server streaming RPCs (#1140)
• Ensure that RoundRobin.Close() does not panic. (#1139)
• fix server panic trying to send on stream as client disconnects #1111 (#1115)
• Suppress server log message when EOF without receiving data for preface (#1052)
• clientconn, server: replace time.After with time.NewTimer (#998)
• reflection: check ServerReflectionInfo error (#958)

Documentation

• transport: fix minor typo in 'GoAway' godoc (#1284)
• Update references to route_guide.proto to use new directory name (#1270)
• Improve contributing.md and add issue template (#1267)
• Fixed comment spelling (#1254)
• Defined GA and add pointer to benchmarks (#1239)
• Add doc and example for mocking streaming RPCs (#1230)
• Fix doc (#1221)
• stress/client: fix minor typo (#957)

Testing

• add MaxConcurrentStreams to benchmark_test when start the server (#1271)
• re-enable handler_server in end2end test, and fix some failed tests (#1259)
• call listen with "localhost:port" instead of ":port" in tests (#1237)
• Travis: add staticcheck (#1019)

Release 1.3.0

API change

• Never encode binary metadata within the metadata map (#1188)
• Update grpclb proto and move grpclb into package grpc (#1186)
• Change status package to deal with concrete types instead of interfaces (#1171)
• Behavior change: do not strip out gRPC user-agent (#1158)
• Separate incoming and outgoing metadata in context (#1157)
• Add status package for reporting gRPC status and errors (#1156)
• remove support for go1.5 (#1132)

New Feature

• Client load report for grpclb. (#1200)
• Client should update keepalive parameters upon receiving GoAway (#1169)
• Implementation for server enforcement of keepalive policy. (#1147)
• Add grpc.Version string and use it in the UA (#1144)
• Support max age(#1119)
• Support proxy with dialer (#1098)

Behavior change

• populate initReq target name and fix IP []byte type in grpclb (#1145)
• pick a random address if the current in use is deleted by resolver (#1135)
• :authority should include port number (#1123)
• Don't return an error from dial if the balancer returns no initial servers (#1112)

Bug fix

• Fix nil pointer dereferences from status.FromProto(nil) (#1211)
• Use unpadded base64 encoding for binary metadata headers; handle padded or unpadded input (#1209)
• Use proto.Equal for equalities on Go proto messages (#1204)
• Move handling stats.End to clientStream.finish() (#1182)
• grpclb should connect to the second balancer (#1181)
• add error handling for InvalidArgument error from sendResponse() (#1173)
• transport: implement GoString on Stream (#1167)
• Bug fix(Issue#1141): Check if peer is nil before trying to derefer it. (#1143)
• Make sure all in-flight streams close when ClientConn.Close() is called. (#1136)

Performance

• opt in to frame reuse on the framer to reduce garbage (#1096)
• use proto.Buffer API for protobuf codec and cache proto.Buffer structs (#1010)

Documentation

• add document to ClientHandshake about returning temporary error (#1125)

Release 1.2.1

• Add grpc.Version string and use it in the UA (#1144)
• transport: implement GoString on Stream (#1167)

Release 1.2.0

New features

• Health check keep alive client side implementation #993
• Client should have a check on maximum size of received message size #1117
• ClientHandshake returns AuthInfo #956
• Add calloption to retrieve peer information #1066

Bug fixes

• Cap the client side default number of max concurrent streams per connection to 100 #1071
• Use codes.Code.String() rather than logging integers #1027
• Account for padding in flow control, when received frame uses it #1076
• Client should send a RST_STREAM before freeing the quota on rpc context timeout #1124

Documentation

• Add document and example for go mock #1021