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Provide an ImmutableRequestBuilder so addQueryParams/setQueryParams method argument are not mutated #1544

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@lpfeup

Description

the addQueryParams/setQueryParams methods are assigning the passed argument directly to the class field queryParams. This has unwanted side-effects.

Code:

RequestBuilderBase.addQueryParams

RequestBuilderBase.setQueryParams

Example:

List<Param> params = new ArrayList<>();
params.add(new Param("testKey", "testVal"));
		
Request request = httpClient.prepareGet(url)
 .setQueryParams(params)
 .addQueryParam("testKey2", "testVal2") // params list is modified here
 .build();
params.forEach(p -> System.out.println(p.getName() + ": " + p.getValue()));
// EXPECTED:
// testKey: testVal
// OUTPUT:
// testKey: testVal
// testKey2: testVal2

Another example:

// params as unmodifiable collection
List<Param> params = Collections.singletonList(new Param("testKey", "testVal"));
		
Request request = httpClient.prepareGet(url)
 .setQueryParams(params)
 .addQueryParam("testKey2", "testVal2")
 .build();
// throws java.lang.UnsupportedOperationException on addQueryParam("testKey2", "testVal2")

I suggest replacing the assignments queryParams = params with copies as below:

queryParams = new ArrayList<>(params);

Would you be willing to accept a pull request?

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