1. 概述
本快速教程将展示如何使用Apache HttpClient发送自定义User-Agent标头。
2. 在HttpClient上设置User-Agent
我们可以在配置客户端本身时设置User-Agent：
HttpClients.custom().setUserAgent("Mozilla/5.0 Firefox/26.0").build();
完整的示例如下：
@Test
void whenClientUsesCustomUserAgent_thenCorrect() throws IOException {
CloseableHttpClient client = HttpClients.custom()
.setUserAgent("Mozilla/5.0 Firefox/26.0")
.build();
final HttpGet request = new HttpGet(SAMPLE_URL);
String response = client.execute(request, new BasicHttpClientResponseHandler());
logger.info("Response -> {}", response);
}
3. 在单个请求中设置User-Agent
还可以在单个请求上设置自定义User-Agent标头，从而为我们的客户端增加更多灵活性：
@Test
void whenRequestHasCustomUserAgent_thenCorrect() throws IOException {
CloseableHttpClient client = HttpClients.createDefault();
final HttpGet request = new HttpGet(SAMPLE_URL);
request.setHeader(HttpHeaders.USER_AGENT, "Mozilla/5.0 Firefox/26.0");
String response = client.execute(request, new BasicHttpClientResponseHandler());
logger.info("Response -> {}", response);
}
4. 总结
本文说明了如何使用HttpClient发送带有自定义User-Agent标头的请求-例如，模拟特定浏览器的行为。
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