diff --git a/src/main/java/moe/yushi/authlibinjector/httpd/URLProcessor.java b/src/main/java/moe/yushi/authlibinjector/httpd/URLProcessor.java
index 9de18f3..8b2bfa6 100644
--- a/src/main/java/moe/yushi/authlibinjector/httpd/URLProcessor.java
+++ b/src/main/java/moe/yushi/authlibinjector/httpd/URLProcessor.java
@@ -188,7 +188,7 @@ private Response reverseProxy(IHTTPSession session, String upstream) throws IOEx
 		conn.setDoOutput(clientIn != null);
 		requestHeaders.forEach(conn::setRequestProperty);
 
-		if (clientIn != null) {
+		if (clientIn != null && !method.equalsIgnoreCase("GET") && !method.equalsIgnoreCase("HEAD")) {
 			try (OutputStream upstreamOut = conn.getOutputStream()) {
 				transfer(clientIn, upstreamOut);
 			}