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      <div class="go-Content about-Content">
        <h1 data-test-id="about-heading">About pkgsite</h1>
        <p>
          Welcome to pkg.go.dev, your source for information about Go packages and modules.
        </p>

        <h2 id="adding-a-package">Adding a package</h2>
        <p>
          Data for the site is downloaded from
          <a href="https://proxy.golang.org/">proxy.golang.org</a>.
          We monitor the <a href="https://index.golang.org/index">Go Module Index</a>
          regularly for new packages to add to pkg.go.dev.
          If you don’t see a package on pkg.go.dev, you can add it by doing one of the following:
        </p>
        <ul>
          <li>
            <p>
              Visiting that page on pkg.go.dev, and clicking the “Request” button.
              For example:
              <br />
              <code>https://pkg.go.dev/example.com/my/module</code>
            </p>
          </li>
          <li>
            <p>
              Making a request to proxy.golang.org for the module version,
              to any endpoint specified by the
              <a href="/cmd/go/#hdr-Module_proxy_protocol">Module proxy protocol</a>.
              For example:
              <br />
              <code>https://proxy.golang.org/example.com/my/module/@v/v1.0.0.info</code>
            </p>
          </li>
          <li>
            <p>
              Downloading the package via the
              <a href="/cmd/go/#hdr-Add_dependencies_to_current_module_and_install_them">go command</a>.
              For example:
              <br />
              <code>GOPROXY=https://proxy.golang.org GO111MODULE=on go get example.com/my/module@v1.0.0</code>
            </p>
          </li>
        </ul>

        <h2 id="removing-a-package">Removing a package</h2>
        <p>
          If you would like to hide versions of a module on pkg.go.dev, as well as from the <code>go</code> command,
          you should retract them. Retracting a module version involves adding a <code>retract</code> directive to
          your go.mod file and publishing a new version. See the Go blog post
          <a href="https://go.dev/blog/go116-module-changes#module-retraction">New module changes in Go 1.16</a>
          and the <a href="https://go.dev/ref/mod#go-mod-file-retract">modules reference</a> for details.
        </p>
        <p>
          Note that it is possible to retract the latest version of a module; the modules reference link above
          includes an example. Also note that published versions cannot be reused or modified, and this includes
          retracted versions.
        </p>
        <p>
          If you cannot publish a new version with retractions because the source code repository or domain
          name is no longer accessible, or if you want to hide documentation for all current and future versions,
          you can <a href="https://go.dev/s/pkgsite-package-removal">file a request</a> for the pkgsite team to hide
          your package documentation from pkg.go.dev. Note that the package will continue to be available via
          <code>go get</code> or <code>go install</code> unless its module is retracted.
        </p>

        <h2 id="documentation">Documentation</h2>
        <p>
          Documentation is generated based on Go source code downloaded from the Go Module Mirror at
          <code>proxy.golang.org/&lt;module&gt;/@v/&lt;version&gt;.zip</code>.
          New module versions are fetched from index.golang.org and added to pkg.go.dev site every few minutes.
        </p>
        <p>
          The <a href="https://go.dev/blog/godoc">guidelines for writing documentation</a>
          for the godoc tool apply to pkg.go.dev.
        </p>
        <p>
          It’s important to write a good summary of the package in the first sentence of the package comment.
          The go.dev site indexes the first sentence and displays it in search results.
        </p>

        <h3 id="build-context">Build Context</h3>
        <p>
          Most Go packages look and behave the same regardless of the machine architecture
          or operating system. But some have different documentation, even different
          exported symbols, for different architectures or OSes. Some packages may not even
          exist for some architectures.
        </p>
        <p>
          Go calls an OS/architecture pair a “build context” and writes it with a slash,
          like <code>linux/amd64</code>.
          You may also see the terms <code>GOOS</code> and <code>GOARCH</code> for the OS
          and architecture respectively, because those are the names of the environment
          variables that the go command uses.
          (See the <a href="/cmd/go">go command documentation</a> for more information.)
        </p>
        <p>
          If a package exists at only one build context, pkg.go.dev displays that build
          context at the upper right corner of the documentation.
          For example,
          <a href="https://pkg.go.dev/syscall/js">https://pkg.go.dev/syscall/js</a>
          displays “js/wasm”.
        </p>
        <p>
          If a package is different in different build contexts, then pkg.go.dev will
          display one by default and provide a dropdown control at the upper right so you
          can select a different one.
        </p>
        <p>
          For packages that are the same across all build contexts, pkg.go.dev does not
          display any build context information.
        </p>
        <p>
          Although there are many possible OS/architecture pairs, pkg.go.dev considers only a
          <a href="https://go.googlesource.com/pkgsite/+/master/internal/build_context.go#29">handful</a>
          of them. So if a package only exists for unsupported build contexts, pkg.go.dev
          will not display documentation for it.
        </p>

        <h3 id="source-links">Source Links</h3>
        <p>
          Most of the time, pkg.go.dev can determine the location of a package’s source
          files, and provide links from symbols in the documentation to their definitions
          in the source. If your package’s source is not linked, try one of the following
          two approaches.
        </p>
        <p>
          If pkg.go.dev finds a <code>go-source</code> meta tag on your site that follows the
          <a href="https://github.com/golang/gddo/wiki/Source-Code-Links">specified format</a>,
          it can often determine the right links, even though the format doesn’t take
          versioning into account.
        </p>
        <p>
          If that doesn’t work, you will need to add your repo or code-hosting site to
          pkg.go.dev’s list of patterns
          (see <a href="https://go.dev/issues/40477">Go Issue 40477</a> for context).
          Read about how to
          <a href="https://go.googlesource.com/pkgsite#contributing">contribute to pkg.go.dev</a>,
          then produce a CL that adds a pattern to the
          <a href="https://go.googlesource.com/pkgsite/+/refs/heads/master/internal/source/source.go"><code>internal/source</code></a>
          package.
        </p>

        <h2 id="best-practices">Best practices</h2>
        <p>
          Pkg.go.dev surfaces details about Go packages and modules
          in order to help provide guidelines for best practices with Go.
        </p>
        <p>
          Here are the details we surface:
        </p>
        <ul>
          <li>
            <p>
              <b>Has <code>go.mod</code> file</b>.
              The Go module system was introduced in Go 1.11
              and is the official dependency management solution for Go.
              A module version is defined by a tree of source files,
              with a go.mod file in its root.
              <a href="/cmd/go/#hdr-The_go_mod_file">More information about the go.mod file</a>.
            </p>
          </li>
          <li>
            <p>
              <b>Redistributable license</b>.
              Redistributable licenses place minimal restrictions on how software
              can be used, modified, and redistributed.
              For more information on how pkg.go.dev determines if a license is redistributable,
              see our <a href="http://pkg.go.dev/license-policy">license policy</a>.
            </p>
          </li>
          <li>
            <p>
              <b>Tagged version</b>.
              When the go get command resolves modules by default it prioritizes tagged versions.
              When no tagged versions exist, go get looks up the latest known commit.
              Modules with tagged versions give importers more predictable builds.
              See <a href="https://semver.org">semver.org</a> and
              <a href="https://go.dev/blog/module-compatibility">Keeping Your Modules Compatible</a>
              for more information.
            </p>
          </li>
          <li>
            <p>
              <b>Stable version</b>.
              Projects at v0 are assumed to be experimental.
              When a project reaches a stable version – major version v1 or higher –
              breaking changes must be done in a new major version.
              Stable versions give developers the confidence that
              breaking changes won’t occur when they upgrade a package to the latest minor version.
              See <a href="https://go.dev/blog/v2-go-modules">Go Modules: v2 and Beyond</a>
              for more information.
            </p>
          </li>
        </ul>

        <h2 id="creating-a-badge">Creating a badge</h2>
        <p>
          The pkg.go.dev badge provides a way for Go users to learn about the pkg.go.dev page
          associated with a given Go package or module.
          You can create a badge using the <a href="https://pkg.go.dev/badge">badge generation tool</a>.
          The tool will generate html and markdown snippets
          that you can use on your project website or in a README file.
        </p>
        <p>
          <a href="https://pkg.go.dev/golang.org/x/pkgsite"><img src="https://pkg.go.dev/badge/golang.org/x/pkgsite" alt="PkgGoDev"></a>
        </p>

        <h2 id="adding-links">Adding links</h2>
        <p>
          You can add links to your README files and package documentation that will be
          shown on the right side of the pkg.go.dev page.
          For details, see <a href="https://go.dev/issue/42968">this issue</a>.
        </p>

        <h2 id="keyboard-shortcuts">Keyboard Shortcuts</h2>
        <p>
          There are keyboard shortcuts for navigating package documentation pages.
          Type ‘?’ on a package page for help.
        </p>

        <h2 id="bookmarklet">Bookmarklet</h2>
        <p>
          The pkg.go.dev bookmarklet navigates from pages on source code hosts,
          such as GitHub, Bitbucket, Launchpad, etc., to the package documentation.
          To install the bookmarklet, click and drag the following link to your bookmark bar:
          <a href="javascript:(function(){ const pathRegex = window.location.pathname.match(/([^\/]+)(?:\/([^\/]+))?/); const host = window.location.hostname; if (pathRegex) { window.location='https://pkg.go.dev/'+host+'/'+pathRegex[0]; } else { alert('There was an error navigating to pkg.go.dev!'); } })()">Pkg.go.dev Doc</a>
        </p>

        <h2 id="license-policy">License policy</h2>
        <p>
          Information for a given package or module may be limited
          if we are not able to detect a suitable license.
          See our <a href="https://pkg.go.dev/license-policy">license policy</a> for more information.
        </p>

        <h2 id="feedback">Feedback</h2>
        <p>
          Share your ideas, feature requests, and bugs on the
          <a href="https://go.dev/s/discovery-feedback">Go Issue Tracker</a>.
          For questions, please post on the #tools slack channel on the
          <a href="https://invite.slack.golangbridge.org/">Gophers Slack</a>,
          or email the <a href="https://groups.google.com/group/golang-dev">golang-dev mailing list</a>.
        </p>

      </div>
      <aside class="Sidebar">
        <h4>Report Issues</h4>
        <p>If you spot bugs, mistakes, or inconsistencies in the Go project's code or documentation, please let us know by filing a ticket on our <a href="https://github.com/golang/go/issues">issue tracker.</a> Of course, you should check it's not an existing issue before creating a new one.</p>
        <a class="btn" href="https://github.com/golang/go/issues/new/choose">Filing a ticket</a>
      </aside>
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