I am sending the content of an XML to a HTTP server in this way:
URL obj = new URL(targetURL);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setRequestMethod("GET");
con.setRequestProperty("Content-Length", ""
+ Integer.toString(urlParameters.getBytes().length));
con.setRequestProperty("Content-Language", "de-DE");
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();
int responseCode = con.getResponseCode();
The content of string urlParameters is:
mydata=<1000chars of XML content>#mydata=<1000chars of XML content>&...&mydata=<the rest chars of XML content>
Test cases:
If urlParameters does not contain special chars like plus sign (+),
it works fine;
If urlParameters contain plus sign (+), the plus sign is missing on HTTP server;
if the plus sign is replaced with escaped string +, the client got the error code 400:
Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: http://192.168.101.51:80810/abs/P42t/bwb.receive_sync
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1894)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
My Questions:
Why is the plus sign missing? (Update: the reason is as Han commented that the plus sign is considered as space in URL)
Can the string + be sent to HTTP server in this way?
Thanks.
Related
I've just set a Warning HTTP header for the first time. In the System.Net .NET namespace, there's a type WarningHeaderValue with this constructor:
WarningHeaderValue(int code, string agent, string text)
But it throws on my agent string saying
The format of value 'Company Name .NET Origin' is invalid.
What format is legal for the agent? I couldn't glean anything useful from the HTTP spec.
warn-agent = ( uri-host [ ":" port ] ) / pseudonym
; the name or pseudonym of the server adding
; the Warning header field, for use in debugging
; a single "-" is recommended when agent unknown
warn-text = quoted-string
warn-date = DQUOTE HTTP-date DQUOTE
What's missing in all these arcane specifications are examples.
In this case, quoted-string means include quotes within the string.
So instead of: "Deprecated API" , it would be "\"Deprecated API\""
Full example:
HttpResponseMessage response = await base.ExecuteAsync(cancellationToken);
string message = $"\"Deprecated API : use {NewUri} instead.\"";
response.Headers.Warning.Add(new WarningHeaderValue(299, "-", message));
return response;
Environment: ASP.Net MVC 4 using C#
I need to get image by using GET request to a URL /inbound/faxes/{id}/image
I used the code below
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("/inbound/faxes/238991717/image");
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
System.IO.StreamReader stream = new StreamReader(response.GetResponseStream());
but it flags "URL not valid"
I used the complete URL www.interfax.net/inbound/faxes/{id}/image
but the result is same
I want to follow this article to receive faxes
Accepting incoming fax notifications by callback
Can anyone help me to get fax...?
Try like this:
using (var client = new WebClient())
{
byte[] imageData = client.DownloadData("http://www.interfax.net/inbound/faxes/{id}/image");
}
Notice how the url is prefixed with the protocol (HTTP in this case). Also make sure you have replaced the {id} part of the url with the actual id of the image you are trying to retrieve.
I am trying to learn about how a HTTP client works in Java. I am trying to build my own client that will make a request to a web server for a php file.
Currently when I make the request the server gives me the following error:
HTTP/1.1 400 Bad Request
However, I am able to access the file from within a browser no problem. I don't know what I could be doing wrong but I can't figure it out. Below is the code for my HTTP Client class:
public class MyHttpClient {
MyHttpRequest request;
String host;
public MyHttpResponse execute(MyHttpRequest request) throws IOException {
//Creating the response object
MyHttpResponse response = new MyHttpResponse();
//Get web server host and port from request.
String host = request.getHost();
int port = request.getPort();
//Check 1: HOST AND PORT NAME CORRECT!
System.out.println("host: " + host + " port: " + String.valueOf(port));
//Get resource path on web server from requests.
String path = request.getPath();
//Check 2: ENSURE PATH IS CORRECT!
System.out.println("path: " + path);
//Open connection to the web server
Socket s = new Socket(host, port);
//Get Socket input stream and wrap it in Buffered Reader so it can be read line by line.
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(s.getInputStream()));
//Get Socket output stream and wrap it in a Buffered Writer so it can be written to line by line.
PrintWriter outToServer = new PrintWriter(s.getOutputStream(),true);
//Get request method
String method = request.getMethod();
//Check 3: ENSURE REQUEST IS CORRECT GET/POST!
System.out.println("Method: " + method);
//GET REQUEST
if(method.equalsIgnoreCase("GET")){
//Send request to server
outToServer.println("GET " + path + " HTTP/1.1 " + "\r\n");
String line = inFromServer.readLine();
System.out.println("Line: " + line);
}
//Returning the response
return response;
}
}
If anyone could shed some light on this issue I'd appreciate it very much! Thanks.
New Request To Server:
outToServer.print("GET " + path+ " HTTP/1.1" + "\r\n");
outToServer.print("Host: " + host + "\r\n");
outToServer.print("\r\n");
Response:
Method: GET
line: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
line: <html><head>
line: <title>400 Bad Request</title>
line: </head><body>
line: <h1>Bad Request</h1>
line: <p>Your browser sent a request that this server could not understand.<br />
line: </p>
line: <hr>
line: <address>Apache Server at default.secureserver.net Port 80</address>
line: </body></html>
line: null
Do not use PrintWriter. You have to write ascii characters.
s.getOutputStream().write(("GET " + path + " HTTP/1.1\r\n\r\n").getBytes("ASCII"));
I think you need at least to add the Host header in the request.
Example taken from http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol
GET /index.html HTTP/1.1
Host: www.example.com
After the headers are complete you also need to transfer an extra \r\n so the server knows that the request is complete.
Do not use println but print. println adds another \n to every line causing the lines to be terminated with \r\n\n.
This has probably been asked a thousand times... But i'm sure i have all the endpoints and credentials right. It was working yesterday.
Security error:
Error no: 10002
Error message: Security header is not valid
Right now i'm testing against the sandbox server.
Whenever i try the testURL in my browser i get ACK=Success with a token, but i get "Security header is not valid" error when it runs through the code.
It was working a few hours ago but for some reason i keep getting the same error now.
using user/pwd and signature from a sandbox account
https://api-3t.sandbox.paypal.com/nvp
USER=xxxxxxxxxxxxxxxxxxxx
PWD=XXXXXXXXXXXXX
SIGNATURE=XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
I have the following test code:
String testURL = "https://api-3t.sandbox.paypal.com/nvp?USER=xxxxxxxxxxxxxxxxxxxx&PWD=XXXXXXXXXXXXX&SIGNATURE=XXXXXXXXXXXXXXXXXXXXXXXXXXXXX&VERSION=84.0-2276209&PAYMENTREQUEST_0_PAYMENTACTION=Sale&PAYMENTREQUEST_0_AMT=15&RETURNURL=https%3a%2f%2fdomain.com%2fCheckout.aspx&CANCELURL=https%3a%2f%2fdomain.com%2fCheckout.aspx&METHOD=SetExpressCheckout";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(testURL);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
//Send the request to PayPal and get the response
StreamWriter streamOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
streamOut.Write(testURL);
streamOut.Close();
// get resposne
StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream());
string strResponse = HttpUtility.UrlDecode(streamIn.ReadToEnd());
streamIn.Close();
HTTPREsponse when code sends it
TIMESTAMP=2011-11-22T23:25:34Z&CORRELATIONID=392047cb78388&ACK=Failure&VERSION=84.000000&BUILD=2271164&L_ERRORCODE0=10002&L_SHORTMESSAGE0=Security error&L_LONGMESSAGE0=Security header is not valid&L_SEVERITYCODE0=Error
HttpResponse if i just copy paste the testURL in the browser
TOKEN=EC%2d4JW15968AV8121546&TIMESTAMP=2011%2d11%2d22T22%3a59%3a27Z&CORRELATIONID=c790299fd9ac7&ACK=Success&VERSION=84%2e000000&BUILD=2271164
I've tried not to UrlEncode the variables in the test url... same problem
thanks in advance
OK this might be a bug on Paypal's side.
if i change the testUrl from
String testURL = "https://api-3t.sandbox.paypal.com/nvp?USER=XXX&PWD=YYY&SIGNATURE=ZZZ&VERSION=.......&METHOD=SetExpressCheckout";
to
String testURL = "https://api-3t.sandbox.paypal.com/nvp?&x=y&USER=XXX&PWD=YYY&SIGNATURE=ZZZ&VERSION=.......&METHOD=SetExpressCheckout";
it works
See the bolded part with random first querystring variable.
PayPal seems to ignore the first querystring parameter when it's sent from codebehind (which would be user=xxx if there wasn’t x=y before it).
The ActiveForums module we're using as part of our DotNetNuke system has a bug in the XML for it's RSS feed. It doesn't correctly encode ampersands, it leaves them as & rather than encoding them as &
I've reported the bug to the company, but in the mean time I need a fix. So what I've done is create an intermediary page that makes a request to the RSS feed via a System.Net.HttpWebRequest.Create(url) and them performs a Regex.Replace to replaces any unencoded ampersands.
The problem is that when I run the code on our production server I get an exception: The remote server returned an error: (500) Internal Server Error.
The only reason I could think of was around authentication (As the server requires NTLM), however as far as I can tell I'm doing this part of it correctly. My code is shown below:
string html = string.Empty;
string url = "http://intranet.nt.avs/dnn/Default.aspx?tabid=130";
WebResponse response;
WebRequest request = System.Net.HttpWebRequest.Create(url);
request.PreAuthenticate = true;
request.Credentials = System.Net.CredentialCache.DefaultCredentials;
response = request.GetResponse();
using (StreamReader sr = new StreamReader(response.GetResponseStream()) )
{
html = sr.ReadToEnd();
}
// Clean invalid XML
html = Regex.Replace( html, "&(?!amp;|gt;|lt;|quot;|apos;)", "&", RegexOptions.Multiline | RegexOptions.IgnoreCase );
Response.ContentType = "text/xml";
Response.Write( html );
Updated: Here's what the event log says
Error code: 4005
Event message: Forms authentication failed for the request. Reason: The ticket supplied has expired