core/http-auth-aws/src/main/java/software/amazon/awssdk/http/auth/aws/eventstream/internal/io/SigV4DataFramePublisher.java [192:232]:
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    private static String toDebugString(Message m, boolean truncatePayload) {
        StringBuilder sb = new StringBuilder("Message = {headers={");
        Map<String, HeaderValue> headers = m.getHeaders();

        Iterator<Map.Entry<String, HeaderValue>> headersIter = headers.entrySet().iterator();

        while (headersIter.hasNext()) {
            Map.Entry<String, HeaderValue> h = headersIter.next();

            sb.append(h.getKey()).append("={").append(h.getValue().toString()).append("}");

            if (headersIter.hasNext()) {
                sb.append(", ");
            }
        }

        sb.append("}, payload=");

        byte[] payload = m.getPayload();
        byte[] payloadToLog;

        // We don't actually need to truncate if the payload length is already within the truncate limit
        truncatePayload = truncatePayload && payload.length > PAYLOAD_TRUNCATE_LENGTH;

        if (truncatePayload) {
            // Would be nice if BinaryUtils.toHex() could take an array index range instead, so we don't need to copy
            payloadToLog = Arrays.copyOf(payload, PAYLOAD_TRUNCATE_LENGTH);
        } else {
            payloadToLog = payload;
        }

        sb.append(BinaryUtils.toHex(payloadToLog));

        if (truncatePayload) {
            sb.append("...");
        }

        sb.append("}");

        return sb.toString();
    }
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core/auth/src/main/java/software/amazon/awssdk/auth/signer/internal/BaseEventStreamAsyncAws4Signer.java [280:320]:
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    static String toDebugString(Message m, boolean truncatePayload) {
        StringBuilder sb = new StringBuilder("Message = {headers={");
        Map<String, HeaderValue> headers = m.getHeaders();

        Iterator<Map.Entry<String, HeaderValue>> headersIter = headers.entrySet().iterator();

        while (headersIter.hasNext()) {
            Map.Entry<String, HeaderValue> h = headersIter.next();

            sb.append(h.getKey()).append("={").append(h.getValue().toString()).append("}");

            if (headersIter.hasNext()) {
                sb.append(", ");
            }
        }

        sb.append("}, payload=");

        byte[] payload = m.getPayload();
        byte[] payloadToLog;

        // We don't actually need to truncate if the payload length is already within the truncate limit
        truncatePayload = truncatePayload && payload.length > PAYLOAD_TRUNCATE_LENGTH;

        if (truncatePayload) {
            // Would be nice if BinaryUtils.toHex() could take an array index range instead so we don't need to copy
            payloadToLog = Arrays.copyOf(payload, PAYLOAD_TRUNCATE_LENGTH);
        } else {
            payloadToLog = payload;
        }

        sb.append(BinaryUtils.toHex(payloadToLog));

        if (truncatePayload) {
            sb.append("...");
        }

        sb.append("}");

        return sb.toString();
    }
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