diff --git a/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/HTTPSession.java b/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/HTTPSession.java
index 98833d1..4ba8d7b 100644
--- a/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/HTTPSession.java
+++ b/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/HTTPSession.java
@@ -48,6 +48,8 @@ package moe.yushi.authlibinjector.internal.fi.iki.elonen;
 
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
 import static moe.yushi.authlibinjector.util.IOUtils.CONTENT_TYPE_TEXT;
+import static moe.yushi.authlibinjector.util.Logging.log;
+import static moe.yushi.authlibinjector.util.Logging.Level.DEBUG;
 import java.io.BufferedInputStream;
 import java.io.BufferedReader;
 import java.io.ByteArrayInputStream;
@@ -68,7 +70,6 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.StringTokenizer;
 import java.util.function.Function;
-import java.util.logging.Level;
 
 class HTTPSession implements IHTTPSession {
 
@@ -182,7 +183,7 @@ class HTTPSession implements IHTTPSession {
 				this.protocolVersion = st.nextToken();
 			} else {
 				this.protocolVersion = "HTTP/1.1";
-				NanoHTTPD.LOG.log(Level.FINE, "no protocol version specified, strange. Assuming HTTP/1.1.");
+				log(DEBUG, "no protocol version specified, strange. Assuming HTTP/1.1.");
 			}
 
 			Map<String, String> headers = new LinkedHashMap<>();
@@ -363,13 +364,11 @@ class HTTPSession implements IHTTPSession {
 	 *         "foo bar"
 	 */
 	private static String decodePercent(String str) {
-		String decoded = null;
 		try {
-			decoded = URLDecoder.decode(str, "UTF8");
-		} catch (UnsupportedEncodingException ignored) {
-			NanoHTTPD.LOG.log(Level.WARNING, "Encoding not supported, ignored", ignored);
+			return URLDecoder.decode(str, "UTF-8");
+		} catch (UnsupportedEncodingException e) {
+			throw new RuntimeException(e); // never happens
 		}
-		return decoded;
 	}
 
 	/**
diff --git a/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/NanoHTTPD.java b/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/NanoHTTPD.java
index aae022f..9559294 100644
--- a/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/NanoHTTPD.java
+++ b/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/NanoHTTPD.java
@@ -47,6 +47,9 @@
 package moe.yushi.authlibinjector.internal.fi.iki.elonen;
 
 import static moe.yushi.authlibinjector.util.IOUtils.CONTENT_TYPE_TEXT;
+import static moe.yushi.authlibinjector.util.Logging.log;
+import static moe.yushi.authlibinjector.util.Logging.Level.DEBUG;
+import static moe.yushi.authlibinjector.util.Logging.Level.ERROR;
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
@@ -57,8 +60,6 @@ import java.net.Socket;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.atomic.AtomicLong;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 import moe.yushi.authlibinjector.internal.fi.iki.elonen.HTTPSession.ConnectionCloseException;
 
 /**
@@ -111,7 +112,7 @@ public abstract class NanoHTTPD {
 				// SocketTimeoutException, print the
 				// stacktrace
 			} catch (Exception e) {
-				NanoHTTPD.LOG.log(Level.SEVERE, "Communication with the client broken, or an bug in the handler code", e);
+				log(ERROR, "Communication with the client broken, or an bug in the handler code", e);
 			} finally {
 				safeClose(outputStream);
 				safeClose(this.inputStream);
@@ -189,7 +190,7 @@ public abstract class NanoHTTPD {
 					final InputStream inputStream = finalAccept.getInputStream();
 					NanoHTTPD.this.asyncRunner.exec(new ClientHandler(inputStream, finalAccept));
 				} catch (IOException e) {
-					NanoHTTPD.LOG.log(Level.FINE, "Communication with the client broken", e);
+					log(DEBUG, "Communication with the client broken", e);
 				}
 			} while (!NanoHTTPD.this.myServerSocket.isClosed());
 		}
@@ -202,11 +203,6 @@ public abstract class NanoHTTPD {
 	 */
 	public static final int SOCKET_READ_TIMEOUT = 5000;
 
-	/**
-	 * logger to log to.
-	 */
-	static final Logger LOG = Logger.getLogger(NanoHTTPD.class.getName());
-
 	static final void safeClose(Object closeable) {
 		try {
 			if (closeable != null) {
@@ -221,7 +217,7 @@ public abstract class NanoHTTPD {
 				}
 			}
 		} catch (IOException e) {
-			NanoHTTPD.LOG.log(Level.SEVERE, "Could not close", e);
+			log(ERROR, "Could not close", e);
 		}
 	}
 
@@ -345,7 +341,7 @@ public abstract class NanoHTTPD {
 				this.myThread.join();
 			}
 		} catch (Exception e) {
-			NanoHTTPD.LOG.log(Level.SEVERE, "Could not stop all connections", e);
+			log(ERROR, "Could not stop all connections", e);
 		}
 	}
 
diff --git a/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/Response.java b/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/Response.java
index c595d0b..a56a344 100644
--- a/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/Response.java
+++ b/src/main/java/moe/yushi/authlibinjector/internal/fi/iki/elonen/Response.java
@@ -47,6 +47,8 @@
 package moe.yushi.authlibinjector.internal.fi.iki.elonen;
 
 import static java.util.Objects.requireNonNull;
+import static moe.yushi.authlibinjector.util.Logging.log;
+import static moe.yushi.authlibinjector.util.Logging.Level.ERROR;
 import java.io.BufferedWriter;
 import java.io.ByteArrayInputStream;
 import java.io.Closeable;
@@ -64,7 +66,6 @@ import java.util.LinkedHashMap;
 import java.util.Locale;
 import java.util.Map;
 import java.util.TimeZone;
-import java.util.logging.Level;
 
 /**
  * HTTP response. Return one of these from serve().
@@ -195,7 +196,7 @@ public class Response implements Closeable {
 			outputStream.flush();
 			NanoHTTPD.safeClose(this.data);
 		} catch (IOException ioe) {
-			NanoHTTPD.LOG.log(Level.SEVERE, "Could not send response to the client", ioe);
+			log(ERROR, "Could not send response to the client", ioe);
 		}
 	}
 
@@ -210,7 +211,7 @@ public class Response implements Closeable {
 			try {
 				size = Long.parseLong(contentLengthString);
 			} catch (NumberFormatException ex) {
-				NanoHTTPD.LOG.severe("content-length was no number " + contentLengthString);
+				log(ERROR, "content-length was not number " + contentLengthString);
 			}
 		}
 		pw.print("Content-Length: " + size + "\r\n");
@@ -294,8 +295,7 @@ public class Response implements Closeable {
 				}
 				bytes = txt.getBytes(contentType.getEncoding());
 			} catch (UnsupportedEncodingException e) {
-				NanoHTTPD.LOG.log(Level.SEVERE, "encoding problem, responding nothing", e);
-				bytes = new byte[0];
+				throw new RuntimeException(e); // never happens, utf-8 is always available
 			}
 			return newFixedLength(status, contentType.getContentTypeHeader(), new ByteArrayInputStream(bytes), bytes.length);
 		}