java-operator/src/main/java/com/amazonwebservices/blogs/containers/sigv4/AWS4SignerBase.java [78:90]:
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    protected static String getCanonicalizeHeaderNames(Map<String, String> headers) {
        List<String> sortedHeaders = new ArrayList<String>();
        sortedHeaders.addAll(headers.keySet());
        Collections.sort(sortedHeaders, String.CASE_INSENSITIVE_ORDER);

        StringBuilder buffer = new StringBuilder();
        for (String header : sortedHeaders) {
            if (buffer.length() > 0) buffer.append(";");
            buffer.append(header.toLowerCase());
        }

        return buffer.toString();
    }
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lambda-client/src/main/java/com/amazonwebservices/blogs/containers/sigv4/AWS4SignerBase.java [78:90]:
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    protected static String getCanonicalizeHeaderNames(Map<String, String> headers) {
        List<String> sortedHeaders = new ArrayList<String>();
        sortedHeaders.addAll(headers.keySet());
        Collections.sort(sortedHeaders, String.CASE_INSENSITIVE_ORDER);

        StringBuilder buffer = new StringBuilder();
        for (String header : sortedHeaders) {
            if (buffer.length() > 0) buffer.append(";");
            buffer.append(header.toLowerCase());
        }

        return buffer.toString();
    }
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