http-client-spi/src/main/java/software/amazon/awssdk/http/DefaultSdkHttpFullRequest.java [402:439]:
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        @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) {
            headers.forInternalRead().forEach((k, v) -> consumer.accept(k, unmodifiableList(v)));
        }

        @Override
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http-client-spi/src/main/java/software/amazon/awssdk/http/DefaultSdkHttpFullResponse.java [244:281]:
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        @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) {
            headers.forInternalRead().forEach((k, v) -> consumer.accept(k, unmodifiableList(v)));
        }

        @Override
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