public static String getSomething(final String uuid) {
    String serviceUrl = getServiceUrl();
    String path = "user/" + , uuid);
    String requestUrl = serviceUrl + path;
    String httpMethod = "GET";

    Response response = client
            .target(serviceUrl)
            .path(path)
            .request(ExtendedMediaType.APPLICATION_UTF8)
            .get();

    if (response.getStatus() == Response.Status.OK.getStatusCode()) {
        // HTTP 200
        return response.readEntity(String.class);
    } else {
        // confusing code comes here just because
        // I need to decide the type of HTTP 404...

        // trying to parse response body
        try {
            String responseBody = response.readEntity(String.class);
            ObjectMapper mapper = new ObjectMapper();
            ErrorInfo errorInfo = mapper.readValue(responseBody, ErrorInfo.class);

            // re-throw the original exception
            throw new Exception("Response error code: " + response.getInternalErrorCode());

        } catch (IOException e) {
            // this is a real HTTP 404
            throw new ServiceUnavailableError(response, requestUrl, httpMethod);
        }

    // this exception will never be thrown
    throw new Exception("UNEXPECTED ERRORS, BETTER IF YOU DO NOT SEE IT IN THE LOG");
}

public static String getString(final String processId, final String key) {
    String serviceUrl = getServiceUrl();
    String path = String.format("key/%s", key);
    String requestUrl = serviceUrl + path;
    String httpMethod = "GET";

    log(requestUrl);

    Response response = client
            .target(serviceUrl)
            .path(path)
            .request(ExtendedMediaType.APPLICATION_JSON_UTF8)
            .header(CustomHttpHeader.PROCESS_ID, processId)
            .get();

    if (response.getStatus() == Response.Status.OK.getStatusCode()) {
        return response.readEntity(String.class);
    } else {
        String body = response.readEntity(String.class);
        ObjectMapper mapper = new ObjectMapper();
        ErrorInfo errorInfo = mapper.readValue(body, ErrorInfo.class);
        throw new Exception("Response error code: " + response.getInternalErrorCode());
    }

    throw new AnyServerError(response, requestUrl, httpMethod);
}