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