java-operator/src/main/java/com/amazonwebservices/blogs/containers/sigv4/AWS4SignerBase.java [96:116]:
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    protected static String getCanonicalizedHeaderString(Map<String, String> headers) {
        if ( headers == null || headers.isEmpty() ) {
            return "";
        }
        
        // step1: sort the headers by case-insensitive order
        List<String> sortedHeaders = new ArrayList<String>();
        sortedHeaders.addAll(headers.keySet());
        Collections.sort(sortedHeaders, String.CASE_INSENSITIVE_ORDER);

        // step2: form the canonical header:value entries in sorted order. 
        // Multiple white spaces in the values should be compressed to a single 
        // space.
        StringBuilder buffer = new StringBuilder();
        for (String key : sortedHeaders) {
            buffer.append(key.toLowerCase().replaceAll("\\s+", " ") + ":" + headers.get(key).replaceAll("\\s+", " "));
            buffer.append("\n");
        }

        return buffer.toString();
    }
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lambda-client/src/main/java/com/amazonwebservices/blogs/containers/sigv4/AWS4SignerBase.java [96:116]:
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    protected static String getCanonicalizedHeaderString(Map<String, String> headers) {
        if ( headers == null || headers.isEmpty() ) {
            return "";
        }
        
        // step1: sort the headers by case-insensitive order
        List<String> sortedHeaders = new ArrayList<String>();
        sortedHeaders.addAll(headers.keySet());
        Collections.sort(sortedHeaders, String.CASE_INSENSITIVE_ORDER);

        // step2: form the canonical header:value entries in sorted order. 
        // Multiple white spaces in the values should be compressed to a single 
        // space.
        StringBuilder buffer = new StringBuilder();
        for (String key : sortedHeaders) {
            buffer.append(key.toLowerCase().replaceAll("\\s+", " ") + ":" + headers.get(key).replaceAll("\\s+", " "));
            buffer.append("\n");
        }

        return buffer.toString();
    }
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