今天 Retrofit2.2最新版本发布，以下为此次更新内容：

Version 2.2.0 (2017-02-21)

• RxJava 2.x is now supported with a first-party 'adapter-rxjava2' artifact.
  （支持rxJava2了, 使用适配器：compile 'com.squareup.retrofit2:adapter-rxjava2:2.2.0'）

• New: @QueryName annotation allows creating a query parameter with no '=' separator or value.

• New: Support for messages generated by Protobuf 3.0 or newer when using the converter for Google's protobuf.

• New: RxJava 1.x call adapter now correctly handles broken subscribers whose methods throw exceptions.

• New: Add toString() implementations for Response and Result.

• New: The Moshi converter factory now offers methods for enabling null serialization and lenient parsing.

• New: Add createAsync() to RxJava 1.x call adapter factory which executes requests using Call.enqueue() using the underlying HTTP client's asynchronous support.

• New: NetworkBehavior now allows setting an error percentage and returns HTTP errors when triggered.

• HttpException has been moved into the main artifact and should be used instead of the versions embedded in each adapter (which have been deprecated).

• Promote the response body generic type on CallAdapter from the adapt method to the enclosing class. This is a source-incompatible but binary-compatible change which is only relevant if you are implementing your own CallAdapters.

• Remove explicit handling of the now-defunct RoboVM platform.

• Fix: Close response on HTTP 204 and 205 to avoid resource leak.

• Fix: Reflect the canceled state of the HTTP client's Call in Retrofit's Call.

• Fix: Use supplied string converters for the String type on non-body parameters. This allows user converters to handle cases such as when annotating string parameters instead of them always using the raw string.

• Fix: Skip a UTF-8 BOM (if present) when using the converter for Mosh.