我被困在使用HttpURLConnection向Web服务器发出PUT http请求.我有一些代码可以很好地执行PUT请求,并且可以在标头中包含“ Expect 100-Continue Request属性”,但是请尝试一下,因为我似乎无法让函数等待’100 Continue在发送实际的http有效负载之前,来自服务器的响应.

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明显的东西,但是在谷歌搜索后我画了一个空白-有人可以帮忙吗？

如果是,非常感谢:)

Http PUT代码段如下：

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());

解决方法:

对于我来说,为什么不这样设计它并不明显,但是仅当您在执行getOutputStream之前调用setFixedLengthStreamingMode(int contentlen)或the overload for long或setChunkedStreamingMode(int chunklen)之一时,才使用实现Expect：100逻辑的代码.在这种情况下,我建议最简单的第一个.