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Briefly, this error occurs when OpenSearch fails to send a response to a client due to a malformed or invalid request. This could be due to incorrect syntax, unsupported parameters, or a request that exceeds server limits. To resolve this issue, you should first verify the syntax and parameters of your request. Ensure they are correctly formatted and supported by your OpenSearch version. If the request is large, consider breaking it down into smaller parts. Also, check your server’s settings to ensure it can handle the size and complexity of your requests.
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This guide will help you check for common problems that cause the log ” failed to send bad request response ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: response, request, rest.
Log Context
Log “failed to send bad request response” classname is RestController.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
channel.sendResponse(new BytesRestResponse(channel; BAD_REQUEST; e));
} catch (final IOException e) {
if (cause != null) {
e.addSuppressed(cause);
}
logger.warn("failed to send bad request response"; e);
channel.sendResponse(new BytesRestResponse(INTERNAL_SERVER_ERROR; BytesRestResponse.TEXT_CONTENT_TYPE; BytesArray.EMPTY));
}
}
private void dispatchRequest(RestRequest request; RestChannel channel; RestHandler handler) throws Exception {
