Could not parse http response. expected a header name but found – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” could not parse http response. expected a header name but found ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: response and plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “could not parse http response. expected a header name but found [{}]”classname  is HttpResponse.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

String headerName = null;
 while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
 if (token == XContentParser.Token.FIELD_NAME) {
 headerName = parser.currentName();
 } else if (headerName == null){
 throw new ElasticsearchParseException("could not parse http response. expected a header name but found [{}] " +
 "instead"; token);
 } else if (token.isValue()) {
 headers.put(headerName; new String[] { String.valueOf(parser.objectText()) });
 } else if (token == XContentParser.Token.START_ARRAY) {
 List values = new ArrayList<>();

 

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