cmd/golangorg, content: serve /doc from content/static/doc before GOROOT/doc

In the "/doc" directory, files are now served from the
content/static/doc, then from GOROOT/doc (where GOROOT is either a zip
file or the GOROOT directory).

This allows documentation to be moved to golang.org outside of the
normal Go release cycle. For example, this CL moves (but does not
modify) doc/docs.html here. Documentation that is tied to the Go
release cycle (for example, doc/spec.html) will not be moved.

Updates golang/go#33637
Updates golang/go#29206

Change-Id: I5f1c577e0ffddc3418653bdd9b0cc36cf79e3fe1
Reviewed-on: https://go-review.googlesource.com/c/website/+/197638
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

7 files changed, 256 insertions, 18 deletions

diff --git a/cmd/golangorg/appinit.go b/cmd/golangorg/appinit.go
index 5485194c..24a47e79 100644
--- a/cmd/golangorg/appinit.go
+++ b/cmd/golangorg/appinit.go
@@ -75,10 +75,11 @@ func main() {
 		fs.Bind("/", rootfs, "/", vfs.BindReplace)
 	}
 
-	// Use a local copy of root.html instead of the one in the main go repository.
-	// See golang.org/issue/29206 for more info.
-	fs.Bind("/doc/root.html", mapfs.New(static.Files), "/doc/root.html", vfs.BindReplace)
-	fs.Bind("/doc/copyright.html", mapfs.New(static.Files), "/doc/copyright.html", vfs.BindReplace)
+	// Try serving files in /doc from a local copy before trying the main
+	// go repository. This lets us update some documentation outside the
+	// Go release cycle. This includes root.html, which redirects to "/".
+	// See golang.org/issue/29206.
+	fs.Bind("/doc", mapfs.New(static.Files), "/doc", vfs.BindBefore)
 	fs.Bind("/lib/godoc", mapfs.New(static.Files), "/", vfs.BindReplace)
 
 	webroot := getFullPath("/src/golang.org/x/website")
diff --git a/cmd/golangorg/main.go b/cmd/golangorg/main.go
index 1044f7ff..3c825a22 100644
--- a/cmd/golangorg/main.go
+++ b/cmd/golangorg/main.go
@@ -7,7 +7,7 @@
 // Web server tree:
 //
 //	https://golang.org/			main landing page
-//	https://golang.org/doc/	serve from $GOROOT/doc - spec, mem, etc.
+//	https://golang.org/doc/	serve from content/static/doc, then $GOROOT/doc. spec, mem, etc.
 //	https://golang.org/src/	serve files from $GOROOT/src; .go gets pretty-printed
 //	https://golang.org/cmd/	serve documentation about commands
 //	https://golang.org/pkg/	serve documentation about packages
@@ -15,8 +15,8 @@
 //				https://golang.org/pkg/compress/zlib)
 //
 
-// Some pages are being transitioned from $GOROOT to this source tree.
-// See bindings below to see which ones.
+// Some pages are being transitioned from $GOROOT to content/static/doc.
+// See golang.org/issue/29206 and golang.org/issue/33637.
 
 // +build !golangorg
 
@@ -143,15 +143,15 @@ func main() {
 		defer rc.Close() // be nice (e.g., -writeIndex mode)
 		fs.Bind("/", zipfs.New(rc, *zipfile), *goroot, vfs.BindReplace)
 	}
-	// Use a local copy of root.html instead of the one in the main go repository.
-	// See golang.org/issue/29206 for more info.
+	// Try serving files in /doc from a local copy before trying the main
+	// go repository. This lets us update some documentation outside the
+	// Go release cycle. This includes root.html, which redirects to "/".
+	// See golang.org/issue/29206.
 	if *templateDir != "" {
-		fs.Bind("/doc/root.html", vfs.OS(*templateDir), "/doc/root.html", vfs.BindReplace)
-		fs.Bind("/doc/copyright.html", vfs.OS(*templateDir), "/doc/copyright.html", vfs.BindReplace)
+		fs.Bind("/doc", vfs.OS(*templateDir), "/doc", vfs.BindBefore)
 		fs.Bind("/lib/godoc", vfs.OS(*templateDir), "/", vfs.BindBefore)
 	} else {
-		fs.Bind("/doc/root.html", mapfs.New(static.Files), "/doc/root.html", vfs.BindReplace)
-		fs.Bind("/doc/copyright.html", mapfs.New(static.Files), "/doc/copyright.html", vfs.BindReplace)
+		fs.Bind("/doc", mapfs.New(static.Files), "/doc", vfs.BindBefore)
 		fs.Bind("/lib/godoc", mapfs.New(static.Files), "/", vfs.BindReplace)
 	}
 
diff --git a/content/static/doc/docs.html b/content/static/doc/docs.html
new file mode 100644
index 00000000..8f79d3a7
--- /dev/null
+++ b/content/static/doc/docs.html
@@ -0,0 +1,232 @@
+<!--{
+	"Title": "Documentation",
+	"Path": "/doc/",
+	"Template": true
+}-->
+
+<p>
+The Go programming language is an open source project to make programmers more
+productive.
+</p>
+
+<p>
+Go is expressive, concise, clean, and efficient. Its concurrency
+mechanisms make it easy to write programs that get the most out of multicore
+and networked machines, while its novel type system enables flexible and
+modular program construction. Go compiles quickly to machine code yet has the
+convenience of garbage collection and the power of run-time reflection. It's a
+fast, statically typed, compiled language that feels like a dynamically typed,
+interpreted language.
+</p>
+
+<div id="manual-nav"></div>
+
+<h2>Installing Go</h2>
+
+<h3><a href="/doc/install">Getting Started</a></h3>
+<p>
+Instructions for downloading and installing the Go compilers, tools, and
+libraries.
+</p>
+
+
+<h2 id="learning">Learning Go</h2>
+
+<img class="gopher" src="/doc/gopher/doc.png"/>
+
+<h3 id="go_tour">
+	{{if $.GoogleCN}}
+	  A Tour of Go
+	{{else}}
+	  <a href="//tour.golang.org/">A Tour of Go</a>
+	{{end}}
+</h3>
+<p>
+An interactive introduction to Go in three sections.
+The first section covers basic syntax and data structures; the second discusses
+methods and interfaces; and the third introduces Go's concurrency primitives.
+Each section concludes with a few exercises so you can practice what you've
+learned. You can {{if not $.GoogleCN}}<a href="//tour.golang.org/">take the tour
+online</a> or{{end}} install it locally with:
+</p>
+<pre>
+$ go get golang.org/x/tour
+</pre>
+<p>
+This will place the <code>tour</code> binary in your workspace's <code>bin</code> directory.
+</p>
+
+<h3 id="code"><a href="code.html">How to write Go code</a></h3>
+<p>
+{{if not $.GoogleCN}}
+Also available as a <a href="//www.youtube.com/watch?v=XCsL89YtqCs">screencast</a>, this
+{{else}}
+This
+{{end}}
+doc explains how to use the <a href="/cmd/go/">go command</a>
+to fetch, build, and install packages, commands, and run tests.
+</p>
+
+<h3 id="editors"><a href="editors.html">Editor plugins and IDEs</a></h3>
+<p>
+A document that summarizes commonly used editor plugins and IDEs with
+Go support.
+</p>
+
+<h3 id="effective_go"><a href="effective_go.html">Effective Go</a></h3>
+<p>
+A document that gives tips for writing clear, idiomatic Go code.
+A must read for any new Go programmer. It augments the tour and
+the language specification, both of which should be read first.
+</p>
+
+<h3 id="diagnostics"><a href="/doc/diagnostics.html">Diagnostics</a></h3>
+<p>
+Summarizes tools and methodologies to diagnose problems in Go programs.
+</p>
+
+<h3 id="faq"><a href="/doc/faq">Frequently Asked Questions (FAQ)</a></h3>
+<p>
+Answers to common questions about Go.
+</p>
+
+<h3 id="wiki"><a href="/wiki">The Go Wiki</a></h3>
+<p>A wiki maintained by the Go community.</p>
+
+<h4 id="learn_more">More</h4>
+<p>
+See the <a href="/wiki/Learn">Learn</a> page at the <a href="/wiki">Wiki</a>
+for more Go learning resources.
+</p>
+
+
+<h2 id="references">References</h2>
+
+<h3 id="pkg"><a href="/pkg/">Package Documentation</a></h3>
+<p>
+The documentation for the Go standard library.
+</p>
+
+<h3 id="cmd"><a href="/doc/cmd">Command Documentation</a></h3>
+<p>
+The documentation for the Go tools.
+</p>
+
+<h3 id="spec"><a href="/ref/spec">Language Specification</a></h3>
+<p>
+The official Go Language specification.
+</p>
+
+<h3 id="go_mem"><a href="/ref/mem">The Go Memory Model</a></h3>
+<p>
+A document that specifies the conditions under which reads of a variable in
+one goroutine can be guaranteed to observe values produced by writes to the
+same variable in a different goroutine.
+</p>
+
+<h3 id="release"><a href="/doc/devel/release.html">Release History</a></h3>
+<p>A summary of the changes between Go releases.</p>
+
+
+<h2 id="articles">Articles</h2>
+
+{{if not $.GoogleCN}}
+<h3 id="blog"><a href="//blog.golang.org/">The Go Blog</a></h3>
+<p>The official blog of the Go project, featuring news and in-depth articles by
+the Go team and guests.</p>
+{{end}}
+
+<h4>Codewalks</h4>
+<p>
+Guided tours of Go programs.
+</p>
+<ul>
+<li><a href="/doc/codewalk/functions">First-Class Functions in Go</a></li>
+<li><a href="/doc/codewalk/markov">Generating arbitrary text: a Markov chain algorithm</a></li>
+<li><a href="/doc/codewalk/sharemem">Share Memory by Communicating</a></li>
+<li><a href="/doc/articles/wiki/">Writing Web Applications</a> - building a simple web application.</li>
+</ul>
+
+{{if not $.GoogleCN}}
+<h4>Language</h4>
+<ul>
+<li><a href="/blog/json-rpc-tale-of-interfaces">JSON-RPC: a tale of interfaces</a></li>
+<li><a href="/blog/gos-declaration-syntax">Go's Declaration Syntax</a></li>
+<li><a href="/blog/defer-panic-and-recover">Defer, Panic, and Recover</a></li>
+<li><a href="/blog/go-concurrency-patterns-timing-out-and">Go Concurrency Patterns: Timing out, moving on</a></li>
+<li><a href="/blog/go-slices-usage-and-internals">Go Slices: usage and internals</a></li>
+<li><a href="/blog/gif-decoder-exercise-in-go-interfaces">A GIF decoder: an exercise in Go interfaces</a></li>
+<li><a href="/blog/error-handling-and-go">Error Handling and Go</a></li>
+<li><a href="/blog/organizing-go-code">Organizing Go code</a></li>
+</ul>
+
+<h4>Packages</h4>
+<ul>
+<li><a href="/blog/json-and-go">JSON and Go</a> - using the <a href="/pkg/encoding/json/">json</a> package.</li>
+<li><a href="/blog/gobs-of-data">Gobs of data</a> - the design and use of the <a href="/pkg/encoding/gob/">gob</a> package.</li>
+<li><a href="/blog/laws-of-reflection">The Laws of Reflection</a> - the fundamentals of the <a href="/pkg/reflect/">reflect</a> package.</li>
+<li><a href="/blog/go-image-package">The Go image package</a> - the fundamentals of the <a href="/pkg/image/">image</a> package.</li>
+<li><a href="/blog/go-imagedraw-package">The Go image/draw package</a> - the fundamentals of the <a href="/pkg/image/draw/">image/draw</a> package.</li>
+</ul>
+{{end}}
+
+<h4>Tools</h4>
+<ul>
+<li><a href="/doc/articles/go_command.html">About the Go command</a> - why we wrote it, what it is, what it's not, and how to use it.</li>
+<li><a href="/doc/gdb">Debugging Go Code with GDB</a></li>
+<li><a href="/doc/articles/race_detector.html">Data Race Detector</a> - a manual for the data race detector.</li>
+<li><a href="/doc/asm">A Quick Guide to Go's Assembler</a> - an introduction to the assembler used by Go.</li>
+{{if not $.GoogleCN}}
+<li><a href="/blog/c-go-cgo">C? Go? Cgo!</a> - linking against C code with <a href="/cmd/cgo/">cgo</a>.</li>
+<li><a href="/blog/godoc-documenting-go-code">Godoc: documenting Go code</a> - writing good documentation for <a href="/cmd/godoc/">godoc</a>.</li>
+<li><a href="/blog/profiling-go-programs">Profiling Go Programs</a></li>
+<li><a href="/blog/race-detector">Introducing the Go Race Detector</a> - an introduction to the race detector.</li>
+{{end}}
+</ul>
+
+<h4 id="articles_more">More</h4>
+<p>
+See the <a href="/wiki/Articles">Articles page</a> at the
+<a href="/wiki">Wiki</a> for more Go articles.
+</p>
+
+{{if not $.GoogleCN}}
+<h2 id="talks">Talks</h2>
+
+<img class="gopher" src="/doc/gopher/talks.png"/>
+
+<h3 id="video_tour_of_go"><a href="https://research.swtch.com/gotour">A Video Tour of Go</a></h3>
+<p>
+Three things that make Go fast, fun, and productive:
+interfaces, reflection, and concurrency. Builds a toy web crawler to
+demonstrate these.
+</p>
+
+<h3 id="go_code_that_grows"><a href="//vimeo.com/53221560">Code that grows with grace</a></h3>
+<p>
+One of Go's key design goals is code adaptability; that it should be easy to take a simple design and build upon it in a clean and natural way. In this talk Andrew Gerrand describes a simple "chat roulette" server that matches pairs of incoming TCP connections, and then use Go's concurrency mechanisms, interfaces, and standard library to extend it with a web interface and other features. While the function of the program changes dramatically, Go's flexibility preserves the original design as it grows.
+</p>
+
+<h3 id="go_concurrency_patterns"><a href="//www.youtube.com/watch?v=f6kdp27TYZs">Go Concurrency Patterns</a></h3>
+<p>
+Concurrency is the key to designing high performance network services. Go's concurrency primitives (goroutines and channels) provide a simple and efficient means of expressing concurrent execution. In this talk we see how tricky concurrency problems can be solved gracefully with simple Go code.
+</p>
+
+<h3 id="advanced_go_concurrency_patterns"><a href="//www.youtube.com/watch?v=QDDwwePbDtw">Advanced Go Concurrency Patterns</a></h3>
+<p>
+This talk expands on the <i>Go Concurrency Patterns</i> talk to dive deeper into Go's concurrency primitives.
+</p>
+
+<h4 id="talks_more">More</h4>
+<p>
+See the <a href="/talks">Go Talks site</a> and <a href="/wiki/GoTalks">wiki page</a> for more Go talks.
+</p>
+{{end}}
+
+<h2 id="nonenglish">Non-English Documentation</h2>
+
+<p>
+See the <a href="/wiki/NonEnglish">NonEnglish</a> page
+at the <a href="/wiki">Wiki</a> for localized
+documentation.
+</p>
diff --git a/content/static/gen.go b/content/static/gen.go
index 607bb61d..1bfef4ce 100644
--- a/content/static/gen.go
+++ b/content/static/gen.go
@@ -36,6 +36,7 @@ var files = []string{
 	"codewalkdir.html",
 	"dirlist.html",
 	"doc/copyright.html",
+	"doc/docs.html",
 	"doc/root.html",
 	"error.html",
 	"example.html",
diff --git a/content/static/static.go b/content/static/static.go
index e33cd018..a135f161 100644
--- a/content/static/static.go
+++ b/content/static/static.go
@@ -47,6 +47,8 @@ var Files = map[string]string{
 
 	"doc/copyright.html": "<!--{\x0a\x09\"Title\":\x20\"Copyright\"\x0a}-->\x0a\x0a<p>\x0a\x20\x20Except\x20as\x0a\x20\x20<a\x20href=\"https://developers.google.com/site-policies#restrictions\">noted</a>,\x20the\x20contents\x20of\x20this\x0a\x20\x20site\x20are\x20licensed\x20under\x20the\x0a\x20\x20<a\x20href=\"https://creativecommons.org/licenses/by/3.0/\">Creative\x20Commons\x20Attribution\x203.0\x20License</a>,\x0a\x20\x20and\x20code\x20is\x20licensed\x20under\x20a\x20<a\x20href=\"/LICENSE\">BSD\x20license</a>.\x0a</p>\x0a",
 
+	"doc/docs.html": "<!--{\x0a\x09\"Title\":\x20\"Documentation\",\x0a\x09\"Path\":\x20\"/doc/\",\x0a\x09\"Template\":\x20true\x0a}-->\x0a\x0a<p>\x0aThe\x20Go\x20programming\x20language\x20is\x20an\x20open\x20source\x20project\x20to\x20make\x20programmers\x20more\x0aproductive.\x0a</p>\x0a\x0a<p>\x0aGo\x20is\x20expressive,\x20concise,\x20clean,\x20and\x20efficient.\x20Its\x20concurrency\x0amechanisms\x20make\x20it\x20easy\x20to\x20write\x20programs\x20that\x20get\x20the\x20most\x20out\x20of\x20multicore\x0aand\x20networked\x20machines,\x20while\x20its\x20novel\x20type\x20system\x20enables\x20flexible\x20and\x0amodular\x20program\x20construction.\x20Go\x20compiles\x20quickly\x20to\x20machine\x20code\x20yet\x20has\x20the\x0aconvenience\x20of\x20garbage\x20collection\x20and\x20the\x20power\x20of\x20run-time\x20reflection.\x20It's\x20a\x0afast,\x20statically\x20typed,\x20compiled\x20language\x20that\x20feels\x20like\x20a\x20dynamically\x20typed,\x0ainterpreted\x20language.\x0a</p>\x0a\x0a<div\x20id=\"manual-nav\"></div>\x0a\x0a<h2>Installing\x20Go</h2>\x0a\x0a<h3><a\x20href=\"/doc/install\">Getting\x20Started</a></h3>\x0a<p>\x0aInstructions\x20for\x20downloading\x20and\x20installing\x20the\x20Go\x20compilers,\x20tools,\x20and\x0alibraries.\x0a</p>\x0a\x0a\x0a<h2\x20id=\"learning\">Learning\x20Go</h2>\x0a\x0a<img\x20class=\"gopher\"\x20src=\"/doc/gopher/doc.png\"/>\x0a\x0a<h3\x20id=\"go_tour\">\x0a\x09{{if\x20$.GoogleCN}}\x0a\x09\x20\x20A\x20Tour\x20of\x20Go\x0a\x09{{else}}\x0a\x09\x20\x20<a\x20href=\"//tour.golang.org/\">A\x20Tour\x20of\x20Go</a>\x0a\x09{{end}}\x0a</h3>\x0a<p>\x0aAn\x20interactive\x20introduction\x20to\x20Go\x20in\x20three\x20sections.\x0aThe\x20first\x20section\x20covers\x20basic\x20syntax\x20and\x20data\x20structures;\x20the\x20second\x20discusses\x0amethods\x20and\x20interfaces;\x20and\x20the\x20third\x20introduces\x20Go's\x20concurrency\x20primitives.\x0aEach\x20section\x20concludes\x20with\x20a\x20few\x20exercises\x20so\x20you\x20can\x20practice\x20what\x20you've\x0alearned.\x20You\x20can\x20{{if\x20not\x20$.GoogleCN}}<a\x20href=\"//tour.golang.org/\">take\x20the\x20tour\x0aonline</a>\x20or{{end}}\x20install\x20it\x20locally\x20with:\x0a</p>\x0a<pre>\x0a$\x20go\x20get\x20golang.org/x/tour\x0a</pre>\x0a<p>\x0aThis\x20will\x20place\x20the\x20<code>tour</code>\x20binary\x20in\x20your\x20workspace's\x20<code>bin</code>\x20directory.\x0a</p>\x0a\x0a<h3\x20id=\"code\"><a\x20href=\"code.html\">How\x20to\x20write\x20Go\x20code</a></h3>\x0a<p>\x0a{{if\x20not\x20$.GoogleCN}}\x0aAlso\x20available\x20as\x20a\x20<a\x20href=\"//www.youtube.com/watch?v=XCsL89YtqCs\">screencast</a>,\x20this\x0a{{else}}\x0aThis\x0a{{end}}\x0adoc\x20explains\x20how\x20to\x20use\x20the\x20<a\x20href=\"/cmd/go/\">go\x20command</a>\x0ato\x20fetch,\x20build,\x20and\x20install\x20packages,\x20commands,\x20and\x20run\x20tests.\x0a</p>\x0a\x0a<h3\x20id=\"editors\"><a\x20href=\"editors.html\">Editor\x20plugins\x20and\x20IDEs</a></h3>\x0a<p>\x0aA\x20document\x20that\x20summarizes\x20commonly\x20used\x20editor\x20plugins\x20and\x20IDEs\x20with\x0aGo\x20support.\x0a</p>\x0a\x0a<h3\x20id=\"effective_go\"><a\x20href=\"effective_go.html\">Effective\x20Go</a></h3>\x0a<p>\x0aA\x20document\x20that\x20gives\x20tips\x20for\x20writing\x20clear,\x20idiomatic\x20Go\x20code.\x0aA\x20must\x20read\x20for\x20any\x20new\x20Go\x20programmer.\x20It\x20augments\x20the\x20tour\x20and\x0athe\x20language\x20specification,\x20both\x20of\x20which\x20should\x20be\x20read\x20first.\x0a</p>\x0a\x0a<h3\x20id=\"diagnostics\"><a\x20href=\"/doc/diagnostics.html\">Diagnostics</a></h3>\x0a<p>\x0aSummarizes\x20tools\x20and\x20methodologies\x20to\x20diagnose\x20problems\x20in\x20Go\x20programs.\x0a</p>\x0a\x0a<h3\x20id=\"faq\"><a\x20href=\"/doc/faq\">Frequently\x20Asked\x20Questions\x20(FAQ)</a></h3>\x0a<p>\x0aAnswers\x20to\x20common\x20questions\x20about\x20Go.\x0a</p>\x0a\x0a<h3\x20id=\"wiki\"><a\x20href=\"/wiki\">The\x20Go\x20Wiki</a></h3>\x0a<p>A\x20wiki\x20maintained\x20by\x20the\x20Go\x20community.</p>\x0a\x0a<h4\x20id=\"learn_more\">More</h4>\x0a<p>\x0aSee\x20the\x20<a\x20href=\"/wiki/Learn\">Learn</a>\x20page\x20at\x20the\x20<a\x20href=\"/wiki\">Wiki</a>\x0afor\x20more\x20Go\x20learning\x20resources.\x0a</p>\x0a\x0a\x0a<h2\x20id=\"references\">References</h2>\x0a\x0a<h3\x20id=\"pkg\"><a\x20href=\"/pkg/\">Package\x20Documentation</a></h3>\x0a<p>\x0aThe\x20documentation\x20for\x20the\x20Go\x20standard\x20library.\x0a</p>\x0a\x0a<h3\x20id=\"cmd\"><a\x20href=\"/doc/cmd\">Command\x20Documentation</a></h3>\x0a<p>\x0aThe\x20documentation\x20for\x20the\x20Go\x20tools.\x0a</p>\x0a\x0a<h3\x20id=\"spec\"><a\x20href=\"/ref/spec\">Language\x20Specification</a></h3>\x0a<p>\x0aThe\x20official\x20Go\x20Language\x20specification.\x0a</p>\x0a\x0a<h3\x20id=\"go_mem\"><a\x20href=\"/ref/mem\">The\x20Go\x20Memory\x20Model</a></h3>\x0a<p>\x0aA\x20document\x20that\x20specifies\x20the\x20conditions\x20under\x20which\x20reads\x20of\x20a\x20variable\x20in\x0aone\x20goroutine\x20can\x20be\x20guaranteed\x20to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\x0a<h3\x20id=\"go_code_that_grows\"><a\x20href=\"//vimeo.com/53221560\">Code\x20that\x20grows\x20with\x20grace</a></h3>\x0a<p>\x0aOne\x20of\x20Go's\x20key\x20design\x20goals\x20is\x20code\x20adaptability;\x20that\x20it\x20should\x20be\x20easy\x20to\x20take\x20a\x20simple\x20design\x20and\x20build\x20upon\x20it\x20in\x20a\x20clean\x20and\x20natural\x20way.\x20In\x20this\x20talk\x20Andrew\x20Gerrand\x20describes\x20a\x20simple\x20\"chat\x20roulette\"\x20server\x20that\x20matches\x20pairs\x20of\x20incoming\x20TCP\x20connections,\x20and\x20then\x20use\x20Go's\x20concurrency\x20mechanisms,\x20interfaces,\x20and\x20standard\x20library\x20to\x20extend\x20it\x20with\x20a\x20web\x20interface\x20and\x20other\x20features.\x20While\x20the\x20function\x20of\x20the\x20program\x20changes\x20dramatically,\x20Go's\x20flexibility\x20preserves\x20the\x20original\x20design\x20as\x20it\x20grows.\x0a</p>\x0a\x0a<h3\x20id=\"go_concurrency_patterns\"><a\x20href=\"//www.youtube.com/watch?v=f6kdp27TYZs\">Go\x20Concurrency\x20Patterns</a></h3>\x0a<p>\x0aConcurrency\x20is\x20the\x20key\x20to\x20designing\x20high\x20performance\x20network\x20services.\x20Go's\x20concurrency\x20primitives\x20(goroutines\x20and\x20channels)\x20provide\x20a\x20simple\x20and\x20efficient\x20means\x20of\x20expressing\x20concurrent\x20execution.\x20In\x20this\x20talk\x20we\x20see\x20how\x20tricky\x20concurrency\x20problems\x20can\x20be\x20solved\x20gracefully\x20with\x20simple\x20Go\x20code.\x0a</p>\x0a\x0a<h3\x20id=\"advanced_go_concurrency_patterns\"><a\x20href=\"//www.youtube.com/watch?v=QDDwwePbDtw\">Advanced\x20Go\x20Concurrency\x20Patterns</a></h3>\x0a<p>\x0aThis\x20talk\x20expands\x20on\x20the\x20<i>Go\x20Concurrency\x20Patterns</i>\x20talk\x20to\x20dive\x20deeper\x20into\x20Go's\x20concurrency\x20primitives.\x0a</p>\x0a\x0a<h4\x20id=\"talks_more\">More</h4>\x0a<p>\x0aSee\x20the\x20<a\x20href=\"/talks\">Go\x20Talks\x20site</a>\x20and\x20<a\x20href=\"/wiki/GoTalks\">wiki\x20page</a>\x20for\x20more\x20Go\x20talks.\x0a</p>\x0a{{end}}\x0a\x0a<h2\x20id=\"nonenglish\">Non-English\x20Documentation</h2>\x0a\x0a<p>\x0aSee\x20the\x20<a\x20href=\"/wiki/NonEnglish\">NonEnglish</a>\x20page\x0aat\x20the\x20<a\x20href=\"/wiki\">Wiki</a>\x20for\x20localized\x0adocumentation.\x0a</p>\x0a",
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diff --git a/go.mod b/go.mod
index 9ee70d38..f1f3f5a4 100644
--- a/go.mod
+++ b/go.mod
@@ -6,9 +6,8 @@ require (
 	cloud.google.com/go v0.38.0
 	github.com/gomodule/redigo v2.0.0+incompatible
 	go.opencensus.io v0.22.0 // indirect
-	golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2
-	golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c
-	golang.org/x/tools v0.0.0-20190516015132-d1a3278ee749
+	golang.org/x/net v0.0.0-20190620200207-3b0461eec859
+	golang.org/x/tools v0.0.0-20190930201159-7c411dea38b0
 	google.golang.org/api v0.9.0 // indirect
 	google.golang.org/appengine v1.5.0
 )
diff --git a/go.sum b/go.sum
index 25d42728..5a5d064e 100644
--- a/go.sum
+++ b/go.sum
@@ -51,6 +51,8 @@ golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c h1:uOCk1iQW6Vc18bnC13MfzScl+wdKBmM9Y9kU7Z83/lw=
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 h1:SVwTIAaPC2U/AvvLNZ2a7OVsmBpC8L5BlwK1whH3hm0=
@@ -79,8 +81,9 @@ golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190506145303-2d16b83fe98c/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
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