http-client-spi/src/main/java/software/amazon/awssdk/http/DefaultSdkHttpFullRequest.java [119:157]:
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    @Override
    public Map<String, List<String>> headers() {
        return headers.forExternalRead();
    }

    @Override
    public List<String> matchingHeaders(String header) {
        return unmodifiableList(headers.forInternalRead().getOrDefault(header, emptyList()));
    }

    @Override
    public Optional<String> firstMatchingHeader(String headerName) {
        List<String> headers = this.headers.forInternalRead().get(headerName);
        if (headers == null || headers.isEmpty()) {
            return Optional.empty();
        }

        String header = headers.get(0);
        if (StringUtils.isEmpty(header)) {
            return Optional.empty();
        }

        return Optional.of(header);
    }

    @Override
    public Optional<String> firstMatchingHeader(Collection<String> headersToFind) {
        for (String headerName : headersToFind) {
            Optional<String> header = firstMatchingHeader(headerName);
            if (header.isPresent()) {
                return header;
            }
        }

        return Optional.empty();
    }

    @Override
    public void forEachHeader(BiConsumer<? super String, ? super List<String>> consumer) {
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http-client-spi/src/main/java/software/amazon/awssdk/http/DefaultSdkHttpFullResponse.java [57:95]:
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    @Override
    public Map<String, List<String>> headers() {
        return headers.forExternalRead();
    }

    @Override
    public List<String> matchingHeaders(String header) {
        return unmodifiableList(headers.forInternalRead().getOrDefault(header, emptyList()));
    }

    @Override
    public Optional<String> firstMatchingHeader(String headerName) {
        List<String> headers = this.headers.forInternalRead().get(headerName);
        if (headers == null || headers.isEmpty()) {
            return Optional.empty();
        }

        String header = headers.get(0);
        if (StringUtils.isEmpty(header)) {
            return Optional.empty();
        }

        return Optional.of(header);
    }

    @Override
    public Optional<String> firstMatchingHeader(Collection<String> headersToFind) {
        for (String headerName : headersToFind) {
            Optional<String> header = firstMatchingHeader(headerName);
            if (header.isPresent()) {
                return header;
            }
        }

        return Optional.empty();
    }

    @Override
    public void forEachHeader(BiConsumer<? super String, ? super List<String>> consumer) {
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