额外的http标头不起作用

Question

我正试图在我的代码-中向http和下面的代码中添加标题

URL url = new URL("http://localhost:8080/share/page"); 
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("SsoUserHeader", "admin"); 
conn.addRequestProperty("mysso", "hi");
conn.setRequestProperty("Authorization",basicAuth );
conn.connect();
Map<String, List<String>> hdrs = conn.getHeaderFields();
Set<String> hdrKeys = hdrs.keySet();
for (String k : hdrKeys)
    System.out.println("Key: " + k + "  Value: " + hdrs.get(k));
System.out.println("Header1: "+conn.getHeaderField("SsoUserHeader"));
System.out.println("Header2: "+conn.getHeaderField("mysso"));
System.out.println("Header3: "+conn.getHeaderField("Authorization"));

但当我试图打印这些标头的值时，它会显示为null。请告诉我如何获取标头值。输出我得到

Key: null  Value: [HTTP/1.1 200 OK]
Key: Content-Language  Value: [en-US]
Key: Transfer-Encoding  Value: [chunked]
Key: Date  Value: [Sun, 07 Jul 2013 05:30:45 GMT]
Key: Set-Cookie  Value: [JSESSIONID=E6BCB7632619ABF41D1A7C6D7CDC53E4;  
                                Path=/share/; HttpOnly]
Key: Content-Type  Value: [text/html;charset=utf-8]
Key: Server  Value: [Apache-Coyote/1.1]
Key: Cache-Control  Value: [no-cache]
Header1: null
Header2: null
Header3: null

Answer 1

getHeaderFields()返回在HTTP响应中而不是在HTTP请求中发送的头字段。您从未发送过这些标头：内容语言、传输编码等，但您在getHeaderFields（）中获得了它们。这是因为服务器发送了这些标头。请求中设置的自定义标题字段将可用于http://localhost:8080/share/page

/页面可以使用访问这些标题字段

request.getHeader("SsoUserHeader"); //admin
request.getHeader("mysso"); //hi
request.getHeader("Authorization");