Android Okhttp Unexpected char 0

错误信息：

Caused by: java.lang.IllegalArgumentException: Unexpected char 0x20 at 4 in header name: test
   at okhttp3.Headers.checkName(Headers.java:273)
   at okhttp3.Headers$Builder.add(Headers.java:323)
   at retrofit2.RequestFactory$Builder.parseHeaders(RequestFactory.java:313)
   at retrofit2.RequestFactory$Builder.parseMethodAnnotation(RequestFactory.java:248)
   at retrofit2.RequestFactory$Builder.build(RequestFactory.java:181)
   at retrofit2.RequestFactory.parseAnnotations(RequestFactory.java:67)
   at retrofit2.ServiceMethod.parseAnnotations(ServiceMethod.java:26)
   at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:202)
   at retrofit2.Retrofit$1.invoke(Retrofit.java:160)
   at java.lang.reflect.Proxy.invoke(Proxy.java:393)
   at $Proxy4.obtainScannedImageFile(Unknown Source)
   at com.cirros.ricoh.scan.model.ScanModel.obtainScannedImageFile(ScanModel.java:53)
   at com.cirros.ricoh.scan.presenter.ScanPresenter.obtainScannedImageFile(ScanPresenter.java:65)
   at com.cirros.ricoh.scan.activity.ScanActivity.lambda$initView$0$ScanActivity(ScanActivity.java:354)
   at com.cirros.ricoh.scan.activity.-$$Lambda$ScanActivity$6L2Sl-L4ZoBn_4k8KxAV_MBTgSw.accept(lambda)
   at io.reactivex.internal.subscribers.LambdaSubscriber.onNext(LambdaSubscriber.java:65)
   ... 10 more

错误是出现特殊字符空格，如下：

@Headers("test : gw.address:54080")
@GET("/test")
Call<Object> test();

其实错误消息也提示是第四个字符错误，从0到4刚好是空格。

解决

只需要把那个空格删除掉就行。
其实是okhttp头部header做了拦截，有一些特殊字符和格式过不去。
我这里就是格式错误导致的，只需要把test后面的空格删除掉就行，让:连接test就行。

@Headers("test: gw.address:54080")
@GET("/test")
Call<Object> test();