utils/common/src/main/java/org/apache/brooklyn/util/http/executor/HttpRequest.java [72:80]:
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        public Builder headers(Map<String, String> val) {
            if (checkNotNull(val, "headers").keySet().contains(null)) {
                throw new NullPointerException("Headers must not contain null key");
            }
            for (Map.Entry<String, String> entry : val.entrySet()) {
                header(entry.getKey(), entry.getValue());
            }
            return this;
        }
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utils/common/src/main/java/org/apache/brooklyn/util/http/executor/HttpResponse.java [67:75]:
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        public Builder headers(Map<String, String> val) {
            if (checkNotNull(val, "headers").keySet().contains(null)) {
                throw new NullPointerException("Headers must not contain null key");
            }
            for (Map.Entry<String, String> entry : val.entrySet()) {
                header(entry.getKey(), entry.getValue());
            }
            return this;
        }
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