diff --git a/.gitignore b/.gitignore
index 8c7749da..97c10bd2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -161,5 +161,10 @@ ENV/
 # Rope project settings
 .ropeproject
 
+# localhost cert authority intermediate files
+misc/localhost.csr
+misc/localhostCA.key
+misc/localhostCA.srl
+
 node_modules
-vendor
\ No newline at end of file
+vendor
diff --git a/README.md b/README.md
index e842843f..1530e7f9 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@
 [![GoDoc](http://img.shields.io/badge/GoDoc-Reference-blue.svg)](https://godoc.org/github.com/improbable-eng/grpc-web/go/grpcweb) 
 [![Apache 2.0 License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
 [![quality: alpha](https://img.shields.io/badge/quality-alpha-orange.svg)](#status)
+[![Slack](slack.png)](https://join.slack.com/t/improbable-eng/shared_invite/enQtMzQ1ODcyMzQ5MjM4LWY5ZWZmNGM2ODc5MmViNmQ3ZTA3ZTY3NzQwOTBlMTkzZmIxZTIxODk0OWU3YjZhNWVlNDU3MDlkZGViZjhkMjc)
 
 [gRPC](http://www.grpc.io/) is a modern, [HTTP2](https://hpbn.co/http2/)-based protocol, that provides RPC semantics using the strongly-typed *binary* data format of [protocol buffers](https://developers.google.com/protocol-buffers/docs/overview) across multiple languages (C++, C#, Golang, Java, Python, NodeJS, ObjectiveC, etc.)
 
diff --git a/example/README.md b/example/README.md
index b5b99c61..015031ec 100644
--- a/example/README.md
+++ b/example/README.md
@@ -10,9 +10,8 @@
 
 ### Using HTTP2
 
-HTTP2 requires TLS. This repository contains certificates in the `misc` directory. You can optionally generate your own replacements using the `gen_cert.sh` in the same directory.
-
-Follow [this guide](http://stackoverflow.com/questions/7580508/getting-chrome-to-accept-self-signed-localhost-certificate) to accept the certificates in Chrome.
+HTTP2 requires TLS. This repository contains certificates in the `../misc` directory which are used by the server. You can optionally generate your own replacements using the `gen_cert.sh` in the same directory.
+You will need to import the `../misc/localhostCA.pem` certificate authority into your browser, checking the "Trust this CA to identify websites" so that your browser trusts the localhost server.
 
 * `npm run start:tls` to start the Golang server and Webpack dev server with the certificates in `misc`
 * Go to `https://localhost:8082`
diff --git a/example/go/Gopkg.lock b/example/go/Gopkg.lock
index cfd5b181..6dcad9ab 100644
--- a/example/go/Gopkg.lock
+++ b/example/go/Gopkg.lock
@@ -2,50 +2,110 @@
 
 
 [[projects]]
-  branch = "master"
   name = "github.com/golang/protobuf"
-  packages = ["proto","ptypes","ptypes/any","ptypes/duration","ptypes/timestamp"]
-  revision = "1e59b77b52bf8e4b449a57e6f79f21226d571845"
+  packages = [
+    "proto",
+    "ptypes",
+    "ptypes/any",
+    "ptypes/duration",
+    "ptypes/timestamp"
+  ]
+  revision = "925541529c1fa6821df4e44ce2723319eb2be768"
+  version = "v1.0.0"
+
+[[projects]]
+  name = "github.com/gorilla/websocket"
+  packages = ["."]
+  revision = "ea4d1f681babbce9545c9c5f3d5194a789c89f5b"
+  version = "v1.2.0"
 
 [[projects]]
   name = "github.com/improbable-eng/grpc-web"
   packages = ["go/grpcweb"]
-  revision = "7174732598544bdecfa12fb81ca2f1601cf1b587"
-  version = "0.3.0-beta"
+  revision = "58d1f6c3d97b6d81d7eebd7d26d5942a1d40cb46"
+  version = "0.6.0"
 
 [[projects]]
   name = "github.com/rs/cors"
   packages = ["."]
-  revision = "7af7a1e09ba336d2ea14b1ce73bf693c6837dbf6"
-  version = "v1.2"
+  revision = "feef513b9575b32f84bafa580aad89b011259019"
+  version = "v1.3.0"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/net"
-  packages = ["context","http2","http2/hpack","idna","internal/timeseries","lex/httplex","trace"]
-  revision = "d866cfc389cec985d6fda2859936a575a55a3ab6"
+  packages = [
+    "context",
+    "http/httpguts",
+    "http2",
+    "http2/hpack",
+    "idna",
+    "internal/timeseries",
+    "lex/httplex",
+    "trace"
+  ]
+  revision = "5f9ae10d9af5b1c89ae6904293b14b064d4ada23"
 
 [[projects]]
-  branch = "master"
   name = "golang.org/x/text"
-  packages = ["collate","collate/build","internal/colltab","internal/gen","internal/tag","internal/triegen","internal/ucd","language","secure/bidirule","transform","unicode/bidi","unicode/cldr","unicode/norm","unicode/rangetable"]
-  revision = "eb22672bea55af56d225d4e35405f4d2e9f062a0"
+  packages = [
+    "collate",
+    "collate/build",
+    "internal/colltab",
+    "internal/gen",
+    "internal/tag",
+    "internal/triegen",
+    "internal/ucd",
+    "language",
+    "secure/bidirule",
+    "transform",
+    "unicode/bidi",
+    "unicode/cldr",
+    "unicode/norm",
+    "unicode/rangetable"
+  ]
+  revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
+  version = "v0.3.0"
 
 [[projects]]
   branch = "master"
   name = "google.golang.org/genproto"
   packages = ["googleapis/rpc/status"]
-  revision = "a8101f21cf983e773d0c1133ebc5424792003214"
+  revision = "7fd901a49ba6a7f87732eb344f6e3c5b19d1b200"
 
 [[projects]]
   name = "google.golang.org/grpc"
-  packages = [".","balancer","balancer/roundrobin","codes","connectivity","credentials","encoding","grpclb/grpc_lb_v1/messages","grpclog","internal","keepalive","metadata","naming","peer","resolver","resolver/dns","resolver/passthrough","stats","status","tap","transport"]
-  revision = "e687fa4e6424368ece6e4fe727cea2c806a0fcb4"
-  version = "v1.8.2"
+  packages = [
+    ".",
+    "balancer",
+    "balancer/base",
+    "balancer/roundrobin",
+    "codes",
+    "connectivity",
+    "credentials",
+    "encoding",
+    "encoding/proto",
+    "grpclb/grpc_lb_v1/messages",
+    "grpclog",
+    "internal",
+    "keepalive",
+    "metadata",
+    "naming",
+    "peer",
+    "resolver",
+    "resolver/dns",
+    "resolver/passthrough",
+    "stats",
+    "status",
+    "tap",
+    "transport"
+  ]
+  revision = "d11072e7ca9811b1100b80ca0269ac831f06d024"
+  version = "v1.11.3"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "9b63a28eff00bb27eaeb856141b43834ef58214d86c906d4220b8cd794db33c0"
+  inputs-digest = "7c4005512c7bcf970b40141c089e3e607d96b953116641c4635299f5a35acdb7"
   solver-name = "gps-cdcl"
   solver-version = 1
diff --git a/example/go/Gopkg.toml b/example/go/Gopkg.toml
index 9425a542..01f78944 100644
--- a/example/go/Gopkg.toml
+++ b/example/go/Gopkg.toml
@@ -1,4 +1,3 @@
-
 # Gopkg.toml example
 #
 # Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
@@ -17,6 +16,31 @@
 #   source = "github.com/myfork/project2"
 #
 # [[override]]
-#  name = "github.com/x/y"
-#  version = "2.4.0"
+#   name = "github.com/x/y"
+#   version = "2.4.0"
+#
+# [prune]
+#   non-go = false
+#   go-tests = true
+#   unused-packages = true
+
+
+[[constraint]]
+  name = "github.com/golang/protobuf"
+  version = "1.0.0"
+
+[[constraint]]
+  name = "github.com/improbable-eng/grpc-web"
+  version = "0.6.0"
+
+[[constraint]]
+  branch = "master"
+  name = "golang.org/x/net"
+
+[[constraint]]
+  name = "google.golang.org/grpc"
+  version = "1.11.3"
 
+[prune]
+  go-tests = true
+  unused-packages = true
diff --git a/misc/gen_cert.sh b/misc/gen_cert.sh
index e4b76fac..8d598aaa 100755
--- a/misc/gen_cert.sh
+++ b/misc/gen_cert.sh
@@ -1,5 +1,23 @@
 #!/bin/bash
-# Regenerate the self-signed certificate for local host.
+# Regenerate the self-signed certificate for local host. Recent versions of firefox and chrome(ium)
+# require a certificate authority to be imported by the browser (localhostCA.pem) while
+# the server uses a cert and key signed by that certificate authority.
+# Based partly on https://stackoverflow.com/a/48791236
+CA_PASSWORD=notsafe
 
-openssl req -x509 -sha256 -nodes -newkey rsa:2048 -days 1024 -keyout localhost.key -out localhost.crt
+# Generate the root certificate authority key with the set password
+openssl genrsa -des3 -passout pass:$CA_PASSWORD -out localhostCA.key 2048
 
+# Generate a root-certificate based on the root-key for importing to browsers.
+openssl req -x509 -new -nodes -key localhostCA.key -passin pass:$CA_PASSWORD -config localhostCA.conf -sha256 -days 1825 -out localhostCA.pem
+
+# Generate a new private key
+openssl genrsa -out localhost.key 2048
+
+# Generate a Certificate Signing Request (CSR) based on that private key (reusing the
+# localhostCA.conf details)
+openssl req -new -key localhost.key -out localhost.csr -config localhostCA.conf
+
+# Create the certificate for the webserver to serve using the localhost.conf config.
+openssl x509 -req -in localhost.csr -CA localhostCA.pem -CAkey localhostCA.key -CAcreateserial \
+-out localhost.crt -days 1024 -sha256 -extfile localhost.conf -passin pass:$CA_PASSWORD
diff --git a/misc/localhost.conf b/misc/localhost.conf
new file mode 100644
index 00000000..9e348e31
--- /dev/null
+++ b/misc/localhost.conf
@@ -0,0 +1,8 @@
+authorityKeyIdentifier=keyid,issuer
+basicConstraints=CA:FALSE
+keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
+subjectAltName = @alt_names
+
+[alt_names]
+DNS.1 = localhost
+
diff --git a/misc/localhost.crt b/misc/localhost.crt
index 91e66525..007162a4 100644
--- a/misc/localhost.crt
+++ b/misc/localhost.crt
@@ -1,21 +1,30 @@
 -----BEGIN CERTIFICATE-----
-MIIDXTCCAkWgAwIBAgIJAJ9+sGD4WNLKMA0GCSqGSIb3DQEBCwUAMEUxCzAJBgNV
-BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX
-aWRnaXRzIFB0eSBMdGQwHhcNMTcxMTE5MDAxNDQzWhcNMjAwOTA4MDAxNDQzWjBF
-MQswCQYDVQQGEwJBVTETMBEGA1UECAwKU29tZS1TdGF0ZTEhMB8GA1UECgwYSW50
-ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB
-CgKCAQEAtbP4y7NBsoYDv1JLdowsE6+OZmH9ll4U7g0DASrgRly+UVIUXt9RumKl
-ly/zCPlDWbzilbdNab8bXLibsodozjo8c3GMIaJXfMKZNvj5Hdv5NLBhPzBfTXNZ
-nPASFwe25Hb9dgnNaTkmxeBCehBBHfg5WP+XEuFvzqTw8rs2yh6oH79Jkrf0+VKv
-J2qpa3CQ3DdFtOKhg5KI4OfvcFvdLmgB8T8qWIx/U73MiNi8jaQEzK+qR2eBXjhC
-8x6iRrba9yVw+SKIJy0q4jMVhwkPbApLUUt0R1VeHwaiEEkKLKS6wPvP4Uo12lH7
-chLWNqewfq+n7T2foCHR7Z9kVylUDQIDAQABo1AwTjAdBgNVHQ4EFgQU42OhBKej
-WYWFW4P+2SWZT+4tERQwHwYDVR0jBBgwFoAU42OhBKejWYWFW4P+2SWZT+4tERQw
-DAYDVR0TBAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEAJGI+eBF6vAtNjXoz+o8o
-8ryXleCayKGs2ehpSk4IEzWAk5uMa+QEOQMeb5JkNMDitNpTw/xX3N7w+Dt/2ohw
-r4ZkBisZLhM8Foz7XJAlki27dysajYh4j3g+w3qF/g8LVtxBbsNHLYTz3bRY05I1
-49YymLA47sQ++5T0TOWrvyVrg8GFwBjEL4s6XwQJNQxlSVXBJsqwFBe/vzAkEHUK
-4i4mVXAWwfaNy0oZ0AjQyT/tERMf8fIPsCbJj2xPzNsS71xnYcLT6LJeSfpnQcQq
-CNPOsr5Idk/ZtthUdCEIcUV7TUt++4ZwitVC9LaZII7X5qn7Q1EKG8LbhxytI+Nb
-eQ==
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+H0dSUEMgV2ViIGxvY2FsaG9zdCBPcmdhbmlzYXRpb24xFjAUBgNVBAsMDU9yZyBV
+bml0IE5hbWUxJDAiBgNVBAMMG0dSUEMgV2ViIGV4YW1wbGUgZGV2IHNlcnZlcjEj
+MCEGCSqGSIb3DQEJARYUZ3JwYy13ZWJAZXhhbXBsZS5jb20wggEiMA0GCSqGSIb3
+DQEBAQUAA4IBDwAwggEKAoIBAQDCX5apirBc6RgQynOoBfsPorOInemtEeAjm00m
+/QF35wszdN9pB41s0wbQtj89SMM4thY/SkGrDDzTDBJRRqHa5klzsRRcbPXi0f5p
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+N7O0aWXX1jalSRIlQ7eEcpX93lk2ehKriaBNNRl4OEd36vxhFQ+OG1dATqrwroPz
+HbWLHxyNRZiLoW3kgiHCKjrwWksm/l3dti6tBIvc42WUOo6qkHQE5MuJI9wYt8My
+twXlc+kW8TOaxGhkHjszrKFgqHSAKjmx
 -----END CERTIFICATE-----
diff --git a/misc/localhost.key b/misc/localhost.key
index e5c517e3..b87c956b 100644
--- a/misc/localhost.key
+++ b/misc/localhost.key
@@ -1,28 +1,27 @@
------BEGIN PRIVATE KEY-----
-MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQC1s/jLs0GyhgO/
-Ukt2jCwTr45mYf2WXhTuDQMBKuBGXL5RUhRe31G6YqWXL/MI+UNZvOKVt01pvxtc
-uJuyh2jOOjxzcYwhold8wpk2+Pkd2/k0sGE/MF9Nc1mc8BIXB7bkdv12Cc1pOSbF
-4EJ6EEEd+DlY/5cS4W/OpPDyuzbKHqgfv0mSt/T5Uq8naqlrcJDcN0W04qGDkojg
-5+9wW90uaAHxPypYjH9TvcyI2LyNpATMr6pHZ4FeOELzHqJGttr3JXD5IognLSri
-MxWHCQ9sCktRS3RHVV4fBqIQSQospLrA+8/hSjXaUftyEtY2p7B+r6ftPZ+gIdHt
-n2RXKVQNAgMBAAECggEAeCzVA1zGud07A0HZmUlyKX72Dq8Gunn1G9DNSOtjtAXI
-9h30TR8kfcKaxJi5BBlgOyzbK6w1bhgwb63FhFlcrvEDZFMYHHKzrFdEYIBguyfu
-9bMmTlWe4qnE/jAltseqZgZw8q3fBpX/F+aP8Q1pE/pFa6B3+cvSV/jtR40c2qY3
-P1Iz9KehAjav9E+GOy670w9klSzK2uQ032SDFVuBeGo62uYYNp8R94kHBq5ksMNr
-WRW001m0ii4JvT9etB/CvMM2DA8kNOMGNhNhh2C/DckDYDx7vsHKYdrIdLuC4GPU
-gC7TYIVX2IgwnGbMeSSYNkI/3ACeYPkfTAImVvqKfQKBgQDu8rCu0TXcFh5xe/xz
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-AlJb9zJKArT8QqGJyIxbcQ==
------END PRIVATE KEY-----
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAwl+WqYqwXOkYEMpzqAX7D6KziJ3prRHgI5tNJv0Bd+cLM3Tf
+aQeNbNMG0LY/PUjDOLYWP0pBqww80wwSUUah2uZJc7EUXGz14tH+adWnZjZzImUw
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+WpOKG6+BAoGBAOAT1JoRGHaccDpWeLhI+JV2lwrNK30sJE5pYATsg7jPm8cOIsjc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+-----END RSA PRIVATE KEY-----
diff --git a/misc/localhostCA.conf b/misc/localhostCA.conf
new file mode 100644
index 00000000..0bcaa2fe
--- /dev/null
+++ b/misc/localhostCA.conf
@@ -0,0 +1,12 @@
+[ req ]
+prompt = no
+distinguished_name = req_distinguished_name
+
+[ req_distinguished_name ]
+C = US
+ST = GRPC State
+L = GRPC Town
+O = GRPC Web localhost Organisation
+OU = Org Unit Name
+CN = GRPC Web example dev server
+emailAddress = grpc-web@example.com
diff --git a/misc/localhostCA.pem b/misc/localhostCA.pem
new file mode 100644
index 00000000..2efac5c2
--- /dev/null
+++ b/misc/localhostCA.pem
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/slack.png b/slack.png
new file mode 100644
index 00000000..eb951fcf
Binary files /dev/null and b/slack.png differ
diff --git a/ts/src/transports/fetch.ts b/ts/src/transports/fetch.ts
index 25fa6bae..230ba86a 100644
--- a/ts/src/transports/fetch.ts
+++ b/ts/src/transports/fetch.ts
@@ -23,14 +23,15 @@ class Fetch implements Transport {
     this.options = transportOptions;
   }
 
-  pump(readerArg: ReadableStreamReader, res: Response): Promise<void | Response> {
+  pump(readerArg: ReadableStreamReader, res: Response) {
     this.reader = readerArg;
     if (this.cancelled) {
       // If the request was cancelled before the first pump then cancel it here
       this.options.debug && debug("Fetch.pump.cancel at first pump");
-      return this.reader.cancel();
+      this.reader.cancel();
+      return;
     }
-    return this.reader.read()
+    this.reader.read()
       .then((result: { done: boolean, value: Uint8Array }) => {
         if (result.done) {
           detach(() => {
@@ -41,7 +42,8 @@ class Fetch implements Transport {
         detach(() => {
           this.options.onChunk(result.value);
         });
-        return this.pump(this.reader, res);
+        this.pump(this.reader, res);
+        return;
       });
   }
 
@@ -58,7 +60,8 @@ class Fetch implements Transport {
         this.options.onHeaders(new Metadata(res.headers as any), res.status);
       });
       if (res.body) {
-        return this.pump(res.body.getReader(), res)
+        this.pump(res.body.getReader(), res)
+        return;
       }
       return res;
     }).catch(err => {