Java、HttpURLConnection 和设置内容长度
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Java, HttpURLConnection and setting the content length
提问by SK9
I'm setting the length of the content in my HttpURLConnection, for a PUT.
我正在为 PUT 设置 HttpURLConnection 中内容的长度。
urlConnection.setRequestProperty("Content-Length", "" + responseJSONArray.toString(2).getBytes("UTF8").length);
The actual number of bytes is 74. However, when I query the content length of urlConnectionI'm returned -1. Why is that? And why are lengths not equal (given that I set this)?
实际字节数为 74。但是，当我查询urlConnection返回的内容长度时-1。这是为什么？为什么长度不相等（假设我设置了这个）？
I must set the content-length because I'm receiving a 411response from the server.
我必须设置内容长度，因为我正在接收411来自服务器的响应。
(Also, in the Sun examplesI've seen the second argument of setRequestPropertyis of type intand not String, which seems odd.)
（此外，在 Sun示例中，我看到了setRequestPropertyis 类型int而不是的第二个参数String，这似乎很奇怪。）
回答by user207421
You shouldn't set this header yourself. Use setFixedLengthStreamingMode()or setChunkedTransferMode().
你不应该自己设置这个标题。使用setFixedLengthStreamingMode()或setChunkedTransferMode()。
回答by Nicolas Modrzyk
Also do not forget to add a setDoOutputto tell your connection you are going to send data.
另外不要忘记添加一个setDoOutput来告诉您的连接您将要发送数据。
回答by Adrian S.
I get same error with "Content-Length" -
“内容长度”出现同样的错误 -
URL url = new URL(targetURL);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "text/plain");
connection.setRequestProperty("Authorization", authKey);
connection.setRequestProperty("Content-Length", Integer.toString(requestJSON.getBytes().length));
And I finally deduced that it happens because one of the Json object fields contains diacritical characters.
我最终推断出它的发生是因为 Json 对象字段之一包含变音字符。
someCategory = "?epu??";
try {
JSONObject postData = new JSONObject();
postData.put("category", someCategory);
.....
That's what the error looks like:
这就是错误的样子：
08-27 18:57:07.842 24263-24263/ro.nexuserp.documentecontabile E/Eror: content-length promised 491001 bytes, but received 491000
