android - Use retrofit to download image file

Question

I use Retrofit 1.6.0 on my Android project,

the request url:

https://example.com/image/thumbs/filename/sample.png

My interface like this:

public interface ImageService {
    @GET("/image/thumbs/filename/{filename}")
    @Streaming
    void getThumbs(
        @Path("filename") String filename,
        Callback<Response> callback
    );
}

HTTP request was success, but there some error occur

D/Retrofit(27613): ---> HTTP GET https://example.com/image/thumbs/filename/sample.png
D/Retrofit(27613): ---> END HTTP (no body)
D/Retrofit(27613): <--- HTTP 200 https://example.com/image/thumbs/filename/sample.png (451ms)
D/Retrofit(27613): : HTTP/1.1 200 OK
D/Retrofit(27613): Connection: Keep-Alive
D/Retrofit(27613): Content-Disposition: inline; filename="sample.png"
D/Retrofit(27613): Content-Type: image/png; charset=binary
D/Retrofit(27613): Date: Wed, 11 Jun 2014 06:02:31 GMT
D/Retrofit(27613): Keep-Alive: timeout=5, max=100
D/Retrofit(27613): OkHttp-Received-Millis: 1402466577134
D/Retrofit(27613): OkHttp-Response-Source: NETWORK 200
D/Retrofit(27613): OkHttp-Sent-Millis: 1402466577027
D/Retrofit(27613): Server: Apache/2.2.22 (Ubuntu)
D/Retrofit(27613): Transfer-Encoding: chunked
D/Retrofit(27613): X-Powered-By: PHP/5.4.28-1+deb.sury.org~precise+1
D/Retrofit(27613): ---- ERROR https://example.com/image/thumbs/filename/sample.png
D/Retrofit(27613): java.io.UnsupportedEncodingException: binary
D/Retrofit(27613):      at java.nio.charset.Charset.forNameUEE(Charset.java:322)
D/Retrofit(27613):      at java.lang.String.<init>(String.java:228)
D/Retrofit(27613):      at retrofit.RestAdapter.logAndReplaceResponse(RestAdapter.java:478)
D/Retrofit(27613):      at retrofit.RestAdapter.access$500(RestAdapter.java:109)
D/Retrofit(27613):      at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:333)
D/Retrofit(27613):      at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
D/Retrofit(27613):      at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:278)
D/Retrofit(27613):      at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)
D/Retrofit(27613):      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
D/Retrofit(27613):      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
D/Retrofit(27613):      at retrofit.Platform$Android$2$1.run(Platform.java:142)
D/Retrofit(27613):      at java.lang.Thread.run(Thread.java:841)
D/Retrofit(27613): Caused by: java.nio.charset.UnsupportedCharsetException: binary
D/Retrofit(27613):      at java.nio.charset.Charset.forName(Charset.java:309)
D/Retrofit(27613):      at java.nio.charset.Charset.forNameUEE(Charset.java:320)
D/Retrofit(27613):      ... 11 more
D/Retrofit(27613): ---- END ERROR

How do I solve this problem?

Answer 1

The issue is the content-type header on the response includes a bogus charset:

Content-Type: image/png; charset=binary

Retrofit sees this and infers that the response is text that it can log. You should report the problem to the server's administrator.

If you report the issue to Retrofit's issue tracker on GitHub, we can probably recover from this problem rather than crashing.