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docs: migrate docs from wiki (#1399)
* docs: migrate docs from wiki * docs: update README links to gh-pages
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‎.gitignore‎

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.DS_Store
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.classpath
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# Built documentation
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docs/
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# Python utilities
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*.pyc

‎docs/_config.yml‎

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theme: jekyll-theme-dinky
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title: Google HTTP Client for Java

‎docs/_data/navigation.yml‎

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toc:
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- page: Overview
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url: index.html
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- page: Setup Instructions
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url: setup.html
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- page: Component Modules
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url: component-modules.html
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- page: Android
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url: android.html
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- page: Google App Engine
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url: google-app-engine.html
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- page: Batching
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url: batching.html
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- page: Media Download
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url: media-download.html
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- page: Media Upload
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url: media-upload.html
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- page: OAuth 2.0
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url: oauth-2.0.html
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- page: Timeouts and Errors
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url: errors.html
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- page: Support
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url: support.html

‎docs/_layouts/default.html‎

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<!doctype html>
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<html lang="{{ site.lang | default: "en-US" }}">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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{% seo %}
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<link rel="stylesheet" href="{{ '/assets/css/style.css?v=' | append: site.github.build_revision | relative_url }}">
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<script src="{{ '/assets/js/scale.fix.js' | relative_url }}"></script>
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<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
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<!--[if lt IE 9]>
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<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
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<![endif]-->
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</head>
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<body>
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<div class="wrapper">
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<header>
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<h1 class="header">{{ site.title | default: site.github.repository_name }}</h1>
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{% for entry in site.data.navigation.toc %}
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<a href="{{ entry.url }}">{{ entry.page }}</a><br/>
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{% endfor %}
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<br/>
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<ul>
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{% if site.show_downloads %}
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<li class="download"><a class="buttons" href="{{ site.github.zip_url }}">Download ZIP</a></li>
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<li class="download"><a class="buttons" href="{{ site.github.tar_url }}">Download TAR</a></li>
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{% endif %}
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<li><a class="buttons github" href="{{ site.github.repository_url }}">View On GitHub</a></li>
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</ul>
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</header>
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<section>
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{{ content }}
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</section>
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<footer>
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<p><small>Hosted on <a href="https://pages.github.com">GitHub Pages</a> using the Dinky theme</small></p>
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</footer>
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</div>
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<!--[if !IE]><script>fixScale(document);</script><![endif]-->
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{% if site.google_analytics %}
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<script>
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(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
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m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
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})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
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ga('create', '{{ site.google_analytics }}', 'auto');
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ga('send', 'pageview');
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</script>
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{% endif %}
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</body>
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</html>

‎docs/android.md‎

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---
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title: Android
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---
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# Running on [Android (@Beta)](#@Beta)
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If you are developing for Android and the Google API you want to use is included
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in the [Google Play Services library][play-services], use that library for the
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best performance and experience.
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To access other Google APIs, use the Google Client Library for Java's
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Android-specific helper classes, which are well-integrated with
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[Android AccountManager][account-manager].
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For example:
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```java
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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// Google Accounts
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credential =
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GoogleAccountCredential.usingOAuth2(this, Collections.singleton(TasksScopes.TASKS));
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SharedPreferences settings = getPreferences(Context.MODE_PRIVATE);
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credential.setSelectedAccountName(settings.getString(PREF_ACCOUNT_NAME, null));
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// Tasks client
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service =
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new com.google.api.services.tasks.Tasks.Builder(httpTransport, jsonFactory, credential)
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.setApplicationName("Google-TasksAndroidSample/1.0").build();
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}
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```
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## Getting started
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Begin by reading the [Android development instructions][http-client-android] for
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the Google HTTP Client Library for Java.
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## Authentication
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As described in the [Android development instructions][http-client-android], the
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best practice on Android is to use the [`AccountManager`][account-manager] class
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(`@Beta`) for centralized identity management and credential token storage.
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For information about the OAuth 2.0 flow, see the
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[OAuth 2.0 instructions for Android][oauth2-android].
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## Partial response and update
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Google APIs support a partial-response protocol that allows you to specify which
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fields are returned to you in the HTTP response. This can significantly reduce
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the size of the response, thereby reducing network usage, parsing response time,
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and memory usage. It works with both JSON and XML.
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The following snippet of code drawn from the Google+ Sample demonstrates how to
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use the partial-response protocol:
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```java
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Plus.Activities.List listActivities = plus.activities().list("me", "public");
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listActivities.setMaxResults(5L);
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// Pro tip: Use partial responses to improve response time considerably
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listActivities.setFields("nextPageToken,items(id,URL,object/content)");
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ActivityFeed feed = listActivities.execute();
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```
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[play-services]: https://developer.android.com/google/play-services/index.html
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[account-manager]: http://developer.android.com/reference/android/accounts/AccountManager.html
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[http-client-android]: https://github.com/googleapis/google-http-java-client/wiki/Android
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[oauth2-android]: https://github.com/googleapis/google-api-java-client#oauth2-android

‎docs/batching.md‎

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---
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title: Batching
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---
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# Batching
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Each HTTP connection that your client makes results in overhead. To reduce
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overhead, you can batch multiple API calls together into a single HTTP request.
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The main classes of interest are [BatchRequest][batch-request] and
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[JsonBatchCallback][json-batch-callback]. The following example shows how to use
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these classes with service-specific generated libraries:
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```java
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JsonBatchCallback<Calendar> callback = new JsonBatchCallback<Calendar>() {
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public void onSuccess(Calendar calendar, HttpHeaders responseHeaders) {
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printCalendar(calendar);
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addedCalendarsUsingBatch.add(calendar);
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}
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public void onFailure(GoogleJsonError e, HttpHeaders responseHeaders) {
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System.out.println("Error Message: " + e.getMessage());
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}
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};
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...
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Calendar client = Calendar.builder(transport, jsonFactory, credential)
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.setApplicationName("BatchExample/1.0").build();
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BatchRequest batch = client.batch();
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Calendar entry1 = new Calendar().setSummary("Calendar for Testing 1");
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client.calendars().insert(entry1).queue(batch, callback);
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Calendar entry2 = new Calendar().setSummary("Calendar for Testing 2");
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client.calendars().insert(entry2).queue(batch, callback);
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batch.execute();
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```
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[batch-request]: https://googleapis.dev/java/google-api-client/latest/com/google/api/client/googleapis/batch/BatchRequest.html
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[json-batch-callback]: https://googleapis.dev/java/google-api-client/latest/com/google/api/client/googleapis/batch/json/JsonBatchCallback.html

‎docs/component-modules.md‎

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---
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title: Component Modules
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---
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# Component Modules
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This libraries is composed of several modules:
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## google-api-client
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The Google API Client Library for Java (`google-api-client`) is designed to be
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compatible with all supported Java platforms, including Android.
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## google-api-client-android
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Extensions to the Google API Client Library for Java
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(`google-api-client-android`) support Java Google Android (only for SDK >= 2.1)
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applications. This module depends on `google-api-client` and
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`google-http-client-android`.
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## google-api-client-servlet
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Servlet and JDO extensions to the Google API Client Library for Java
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(`google-api-client-servlet`) support Java servlet web applications. This module
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depends on `google-api-client` and `google-oauth-client-servlet`.
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## google-api-client-appengine
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Google App Engine extensions to the Google API Client Library for Java
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(`google-api-client-appengine`) support Java Google App Engine applications.
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This module depends on `google-api-client`, `google-api-client-servlet`,
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`google-oauth-client-appengine`, and `google-http-client-appengine`.
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## google-api-client-gson
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GSON extensions to the Google API Client Library for Java
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(`google-api-client-gson`). This module depends on `google-api-client` and
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`google-http-client-gson`.
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## google-api-client-jackson2
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Jackson2 extensions to the Google API Client Library for Java
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(`google-api-client-jackson2`). This module depends on `google-api-client` and
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`google-http-client-jackson2`.
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## google-api-client-java6
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Java 6 (and higher) extensions to the Google API Client Library for Java
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(`google-api-client-java6`). This module depends on `google-api-client` and
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`google-oauth-client-java6`.
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## google-api-client-protobuf
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[Protocol buffer][protobuf] extensions to the Google API Client Library for Java
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(`google-api-client-protobuf`). This module depends on
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`google-http-client-protobuf` and `google-api-client`.
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## google-api-client-xml
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XML extensions to the Google API Client Library for Java
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(`google-api-client-xml`). This module depends on `google-api-client` and
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`google-http-client-xml`.
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[protobuf]: https://developers.google.com/protocol-buffers/docs/overview

‎docs/errors.md‎

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---
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title: Timeout and Errors
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---
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# Timeout and Errors
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## Setting timeouts
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In the following example, which uses the
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[Google Analytics API][google-analytics-api], the `setConnectTimeout` and
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`setReadTimeout` methods are used to set the connect and read timeouts to three
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minutes (in milliseconds) for all requests:
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```java
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private HttpRequestInitializer setHttpTimeout(final HttpRequestInitializer requestInitializer) {
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return new HttpRequestInitializer() {
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@Override
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public void initialize(HttpRequest httpRequest) throws IOException {
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requestInitializer.initialize(httpRequest);
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httpRequest.setConnectTimeout(3 * 60000); // 3 minutes connect timeout
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httpRequest.setReadTimeout(3 * 60000); // 3 minutes read timeout
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}
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};
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GoogleCredential credential = ....
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final Analytics analytics = Analytics.builder(new NetHttpTransport(), jsonFactory, setHttpTimeout(credential)).build();
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```
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## Handling HTTP error responses from Google APIs
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When an error status code is detected in an HTTP response to a Google API that
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uses the JSON format, the generated libraries throw a
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[`GoogleJsonResponseException`][google-json-response-exception].
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The errors use the format specified in [Error responses][error-responses].
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The following example shows one way that you can handle these exceptions:
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```java
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Plus.Activities.List listActivities = plus.activities().list("me", "public");
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try {
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ActivityFeed feed = listActivities.execute();
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...
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} catch (GoogleJsonResponseException e) {
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System.err.println(e.getDetails());
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}
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```
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[google-analytics-api]: https://developers.google.com/analytics/
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[google-json-response-exception]: https://googleapis.dev/java/google-api-client/latest/com/google/api/client/googleapis/json/GoogleJsonResponseException.html
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[error-responses]: https://developers.google.com/url-shortener/v1/getting_started?csw=1#errors

‎docs/google-app-engine.md‎

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---
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title: Running on Google App Engine
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---
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# Running on Google App Engine
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App Engine-specific helpers make quick work of authenticated calls to APIs, and
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you do not need to worry about exchanging code for tokens.
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For example:
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```java
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
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AppIdentityCredential credential =
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new AppIdentityCredential(Arrays.asList(UrlshortenerScopes.URLSHORTENER));
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Urlshortener shortener =
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new Urlshortener.Builder(new UrlFetchTransport(), new JacksonFactory(), credential)
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.build();
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UrlHistory history = shortener.URL().list().execute();
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...
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}
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```
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## Auth helpers
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If you are building a web app that interacts with a user's data via an OAuth
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2.0-enabled API, we've created some helpers to assist you with the process. The
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helpers aim to:
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* Simplify the process of obtaining access tokens
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([`AuthorizationCodeFlow`][authorization-code-flow]).
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* Manage tokens, after they are obtained, by marking them as
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[`PersistenceCapable`][persistence-capable].
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* Simplify the process of making authenticated calls using the access token's
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[credential][credential].
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* Insulate you from the details of authentication when writing servlets.
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## Getting started
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1. Install the Google API Client Library for Java:
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* Follow the [download instructions][setup] and put the library jar files
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into your war/WEB-INF/lib directory.
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* Alternatively, you can use [Maven][setup].
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1. Learn about using [OAuth 2.0 with the authorization code flow for Google App Engine applications][oauth2].
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1. Learn about using [OAuth 2.0 with the Google App Engine Identity API][oauth2-gae].
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1. Take a look at the [Calendar App Engine sample][calendar-sample]. This sample
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combines our Java library and auth helpers to show you how to access end-user
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data from within a Google App Engine web app. The sample also uses [GWT][gwt]
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for the user interface.
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[authorization-code-flow]: https://googleapis.dev/java/google-oauth-client/latest/com/google/api/client/auth/oauth2/AuthorizationCodeFlow.html
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[persistence-capable]: https://cloud.google.com/appengine/docs/java/datastore/
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[credential]: https://googleapis.dev/java/google-oauth-client/latest/com/google/api/client/auth/oauth2/Credential.html
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[setup]: https://github.com/googleapis/google-api-java-client/wiki/Setup
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[oauth2]: https://github.com/googleapis/google-api-java-client/wiki/OAuth2
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[oauth2-gae]: https://github.com/googleapis/google-api-java-client/wiki/OAuth2#gae
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[calendar-sample]: https://github.com/google/google-api-java-client-samples/tree/master/calendar-appengine-sample
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[gwt]: http://www.gwtproject.org/gle-http-java-client/http-transport.html

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