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[英]Java - HttpURLConnection - Content-Length isn't shown in request header
[英]content-length in HttpURLConnection
我正在嘗試將x-www-form-urlencoded
的正文發送到我的本地Web API。 我可以GET
進行GET
。 這是我的工作:
String urlParameters = "user=User&label=GPU+Temp&file=src%2FDataSource0.txt&backgroundColor=rgb(255%2C255%2C255%2C0)&borderColor=rgb(255%2C255%2C255%2C0)&pointBorderColor=rgb(255%2C255%2C255%2C0)&pointHoverBackgroundColor=rgb(255%2C255%2C255%2C0)&pointHoverBorderColor=rgb(255%2C255%2C255%2C0)&min=0&max=100&stepSize=50";
byte[] postData = urlParameters.getBytes(Charset.forName("UTF-8"));
int postDataLength = postData.length;
String request = "http://192.168.1.30:6262/api/values";
URL url = new URL(request);
con = (HttpURLConnection) url.openConnection();
con.setDoOutput(true);
con.setInstanceFollowRedirects(false);
con.setRequestMethod("POST");
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
con.setRequestProperty("charset", "utf-8");
con.setRequestProperty("Content-Length", Integer.toString(postDataLength));
con.connect();
java.net.ProtocolException:內容長度承諾為598個字節,但收到0
因此,這意味着我沒有在POST
發送任何數據,為什么呢?
使用con.setRequestProperty("Content-Length", Integer.toString(postDataLength));
您只是發送了postDataLength
的長度,實際上並沒有設置它的主體。 為了將變量實際發送到Web服務,您需要在調用connect()
之前執行此操作:
OutputStream os = con.getOutputStream();
os.write(urlParameters.getBytes("UTF-8"));
os.close();
您需要這樣做:
body = datos.toString();
content_bytes = body.getBytes("UTF-8");
content_length = content_bytes.length;
// establecer headers.
connection.setRequestProperty( "Content-Type", "application/json; charset=utf-8" );
connection.setRequestProperty( "Content-Length", Integer.toString( content_length ) );
.....
dataOutputStream = new DataOutputStream( connection.getOutputStream() );
dataOutputStream.write(body.getBytes("UTF-8"));
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