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566 B

diff --git a/src/WebResponses.cpp b/src/WebResponses.cpp
index 22a549f..e0b36b3 100644
--- a/src/WebResponses.cpp
+++ b/src/WebResponses.cpp
@@ -318,7 +318,7 @@ size_t AsyncAbstractResponse::_ack(AsyncWebServerRequest *request, size_t len, u
free(buf);
return 0;
}
- outLen = sprintf_P((char*)buf+headLen, PSTR("%x"), readLen) + headLen;
+ outLen = sprintf_P((char*)buf+headLen, PSTR("%04x"), readLen) + headLen;
while(outLen < headLen + 4) buf[outLen++] = ' ';
buf[outLen++] = '\r';
buf[outLen++] = '\n';