add accept:image/webp for image loading

app/src/main/java/jp/juggler/subwaytooter/ActMediaViewer.kt

@@ -462,6 +462,7 @@ class ActMediaViewer : AppCompatActivity(), View.OnClickListener {
 				val request = okhttp3.Request.Builder()
 					.url(url)
 					.cacheControl(App1.CACHE_5MIN)
+					.addHeader("Accept","image/webp,image/*,*/*;q=0.8")
 					.build()
 				
 				if(! client.sendRequest(result,cached = true) {

app/src/main/java/jp/juggler/subwaytooter/view/MyNetworkImageView.kt

@@ -19,6 +19,8 @@ import android.widget.ImageView
 
 import com.bumptech.glide.Glide
 import com.bumptech.glide.RequestManager
+import com.bumptech.glide.load.model.GlideUrl
+import com.bumptech.glide.load.model.LazyHeaders
 import com.bumptech.glide.load.resource.gif.GifDrawable
 import com.bumptech.glide.load.resource.gif.MyGifDrawable
 import com.bumptech.glide.request.target.BaseTarget
@@ -189,10 +191,19 @@ class MyNetworkImageView : AppCompatImageView {
 				return
 			}
 			
+			val glideHeaders = LazyHeaders.Builder()
+				.addHeader("Accept", "image/webp,image/*,*/*;q=0.8")
+				.build()
+			
+			val glideUrl = GlideUrl(url, glideHeaders)
+			
 			mTarget = if(mMayGif) {
-				getGlide()?.load(url)?.into(MyTargetGif(url))
+				getGlide()
+					?.load(glideUrl)
+					?.into(MyTargetGif(url))
 			} else {
-				getGlide()?.asBitmap()?.load(url)?.into(MyTarget(url, desiredWidth, desiredHeight))
+				getGlide()?.asBitmap()?.load(glideUrl)
+					?.into(MyTarget(url, desiredWidth, desiredHeight))
 			}
 		} catch(ex : Throwable) {
 			log.trace(ex)