Java Coding Problems

Setting request headers

The HttpRequest.Builder class uses three methods to set additional headers:

• header​(String name, String value) and setHeader​(String name, String value): These are used to add headers one by one, as shown in the following code:

HttpRequest request = HttpRequest.newBuilder()  .uri(...)  ...  .header("key_1", "value_1")  .header("key_2", "value_2")  ...  .build();HttpRequest request = HttpRequest.newBuilder()  .uri(...)  ...  .setHeader("key_1", "value_1")  .setHeader("key_2", "value_2")  ...  .build();

The difference between header() and setHeader() is that the former adds the specified header while the latter sets the specified header. In other words, header() adds the given value to the list of values for that name/key, while ...