Release 1.7.3

• addrConn: set ac.state to TransientFailure upon non-temporary errors (#1657)
• addrConn: eliminate race on ac.acbw (#1665)
• server: apply deadline to new connections until all handshaking is completed (#1646)
• latency: Listen on localhost:0 instead of :0 in test (#1640)

Release 1.7.2

• Check ac state shutdown before setting it to TransientFailure (#1643)

Release 1.7.1

• Fix connectivity state transitions when dialing #1596

Release 1.7.0

Dependencies

• Remove Go1.6 support (#1492)

API Changes

• Add new Resolver and Balancer APIs (gRFC L9) (#1408)
• New implementation of roundrobin and pickfirst (#1506)

Behavior Changes

• Truncate payload trace string, and turn trace off by default (#1509)

New Features

• Make IO Buffer size configurable. (#1544)
• DNS with new API (#1513)

Performance Improvements

• Use the same hpack encoder on a transport and share it between RPCs. (#1536)

Bug Fixes

• transport: fix racey send to writes channel in WriteStatus (#1546)
• Use Type() method for OAuth tokens instead of accessing TokenType field. (#1537)
• Dedicated goroutine for writing. (#1498)

Documentation

• Update UnknownServiceHandler comment to be clearer about interceptor behavior (#1566)

Release 1.6.0

API Changes

• Add and use connectivity package for states (#1430)
• metadata: Remove NewContext and FromContext for gRFC L7 (#1392)
• Remove expiration_interval from grpclb message (#1477)

Features

• Add status details support to server HTTP handler (#1438)
• stats: add methods to allow setting grpc-trace-bin and grpc-tags-bin headers (#1404)
• Expose ConnectivityState of a ClientConn. (#1385)
• DNS resolver (#1300)

Performance

• Put *gzip.Writer back to pool (#1441)
• Remove defer funtion in recvBufferReader Read method (#1031)

Bug fixes

• When sending a non heads-up goaway close the connection if there are no active streams. (#1474)
• Fix grpclb protos to not cause re-registration of types (#1466)
• transport: fix handling of InTapHandle's returned context (#1461)
• transport: Fix deadlock in client keepalive. (#1460)
• Deduplicate dns record in lookup (#1454)
• Fix host string passed to PerRPCCredentials (#1433)
• Fix a goroutine leak in DialContext (#1424)
• Set peer before sending request (#1423)
• Don't use 64-bit integers with atomic. (#1411)
• Automatic WriteStatus for RecvMsg/SendMsg error on server side (#1409)
• Server should send 2 goaway messages to gracefully shutdown the connection. (#1403)
• Enabling client process multiple GoAways (#1393)
• addrConn: change address to slice of address (#1376)
• Do not create new addrConn when connection error happens (#1369)
• Validate send quota again after acquiring writable channel (#1367)

Documentation

• add comment for the package in benchmark/benchmain/main.go (#1464)
• Add -u to installation command (#1451)
• Update ServerInHandle comments (#1437)
• Add 'experimental' note to ServeHTTP godoc (#1429)
• Use NewOutgoingContext in the metadata doc (#1425)
• Fix missing and wrong license (#1422)
• Change comment on stats.End.Error (#1418)
• Document Server.ServeHTTP (#1406)
• Use log instead of grpclog in routeguide example (#1395)
• Add doc in default implementation fatal functions on os.Exit() (#1365)

Testing

• Check "x/net/context" with go vet like "context" (#1490)
• Remove unnecessary function handleStreamSuspension (#1468)
• Call cancel function to avoid ctx leak (#1465)
• go-generate pb.go files and check in Travis to make sure they don't change (#1426)
• Add flags for tls file path (#1419)
• Call cancel on contexts in tests (#1412)
• benchmark: don't stop timer until after workers are done (#1407)
• Assign testdata path to correct variable (#1397)
• Do not call testdata.Path when defining flags (#1394)
• Fix bufconn.Close to not be blocking. (#1377)
• benchmark: add benchmain/main.go to run benchmark with flag set (#1352)
• benchmark: remove multi-layer for loop (#1339)
• Add testdata package and unify testdata to only one dir (#1297)

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)