如何使用HttpURLConnection在Java中等待Expect 100-continue响应

时间:2017-01-17 22:00:17

标签: java http httpurlconnection legacy

卡住使用HttpURLConnection向网络服务器发出PUT http请求。我有一些代码可以使PUT请求正常,我可以简单地包含“期望100-继续请求属性”#39;然而,在标题中尝试我似乎无法使该功能等待“100继续”#39;在发送实际的http有效负载之前从服务器响应。

我得到以下内容(来自Wireshark)

PUT /post/ HTTP/1.1
User-Agent: curl/7.35.0
Accept: */*
Content-Type: application/x-www-form-urlencoded
Expect: 100-continue
Host: somerandomdomain.info
Connection: keep-alive
Content-Length: 17

Some data for you
HTTP/1.1 100 Continue

...rest of web-server response...

我确定我遗漏了一些显而易见的东西,但是在谷歌搜索后我画了一个空白 - 有人可以帮忙吗?

非常感谢,如果是这样:))

下面的Http PUT代码片段:

String url =   "http://somerandomdomain.info";
String postJsonData = "Some data for you\n";
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();

// Setting basic post request  
con.setRequestMethod("PUT");
con.setRequestProperty("User-Agent", "jcurl/7.35.0");
con.setRequestProperty("Accept", "*/*");
con.setRequestProperty("Content-Length", postData.length() + "");
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
con.setRequestProperty("Expect", "100-continue");

// Send post request  
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(postData);
wr.flush();
wr.close();

int responseCode = con.getResponseCode();
System.out.println("\nSending 'POST' request to URL : " + url);
System.out.println("Post Data : " + postData);
System.out.println("Response Code : " + responseCode);

BufferedReader in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
String output;
StringBuffer response = new StringBuffer();

while ((output = in.readLine()) != null) {
  response.append(output);
}

in.close();

//printing result from response  
System.out.println(response.toString());

1 个答案:

答案 0 :(得分:1)

对我来说,为什么他们以这种方式设计它并不明显,但实现Expect:100逻辑的代码仅在您调用setFixedLengthStreamingMode(int contentlen)the overload for long或{{3}之一时使用在做getOutputStream之前。在这种情况下,我建议第一个最简单。