I know there are similar posts regarding calling an HttpPost method but nothing I've read/implemented has worked for me. I'm simply trying to do a POST call but the response is always null for some reason. I'm new to web development and ASP.
Here's my WebClient code:
using (WebClient webClient = new WebClient())
{
webClient.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
var dataToSend = "=testingu";
var response = webClient.UploadString("http://localhost:5000/core/test", "POST", dataToSend);
Console.WriteLine("Response is: " + response);
}
and here's my HttpPost code:
[HttpPost("/core/test")]
public string PostObj([FromBody]dynamic input)
{
string result = "";
if (input == null)
System.Console.WriteLine("Input is null.");
else
System.Console.WriteLine("Input is not null: " + input);
return result;
}
Whenever PostObj is called, the "Input is null" line is always executed when I'm expecting to see "Input is not null: testingu" printed. It seems like my WebClient code is sound, but I'm pretty new to this so any help is appreciated.
Related
Is it possible to pass parameters with an HTTP get request? If so, how should I then do it? I have found an HTTP post requst (link). In that example the string postData is sent to a webserver. I would like to do the same using get instead. Google found this example on HTTP get here. However no parameters are sent to the web server.
My preferred way is this. It handles the escaping and parsing for you.
WebClient webClient = new WebClient();
webClient.QueryString.Add("param1", "value1");
webClient.QueryString.Add("param2", "value2");
string result = webClient.DownloadString("http://theurl.com");
First WebClient is easier to use; GET arguments are specified on the query-string - the only trick is to remember to escape any values:
string address = string.Format(
"http://foobar/somepage?arg1={0}&arg2={1}",
Uri.EscapeDataString("escape me"),
Uri.EscapeDataString("& me !!"));
string text;
using (WebClient client = new WebClient())
{
text = client.DownloadString(address);
}
In a GET request, you pass parameters as part of the query string.
string url = "http://somesite.com?var=12345";
The WebRequest object seems like too much work for me. I prefer to use the WebClient control.
To use this function you just need to create two NameValueCollections holding your parameters and request headers.
Consider the following function:
private static string DoGET(string URL,NameValueCollection QueryStringParameters = null, NameValueCollection RequestHeaders = null)
{
string ResponseText = null;
using (WebClient client = new WebClient())
{
try
{
if (RequestHeaders != null)
{
if (RequestHeaders.Count > 0)
{
foreach (string header in RequestHeaders.AllKeys)
client.Headers.Add(header, RequestHeaders[header]);
}
}
if (QueryStringParameters != null)
{
if (QueryStringParameters.Count > 0)
{
foreach (string parm in QueryStringParameters.AllKeys)
client.QueryString.Add(parm, QueryStringParameters[parm]);
}
}
byte[] ResponseBytes = client.DownloadData(URL);
ResponseText = Encoding.UTF8.GetString(ResponseBytes);
}
catch (WebException exception)
{
if (exception.Response != null)
{
var responseStream = exception.Response.GetResponseStream();
if (responseStream != null)
{
using (var reader = new StreamReader(responseStream))
{
Response.Write(reader.ReadToEnd());
}
}
}
}
}
return ResponseText;
}
Add your querystring parameters (if required) as a NameValueCollection like so.
NameValueCollection QueryStringParameters = new NameValueCollection();
QueryStringParameters.Add("id", "123");
QueryStringParameters.Add("category", "A");
Add your http headers (if required) as a NameValueCollection like so.
NameValueCollection RequestHttpHeaders = new NameValueCollection();
RequestHttpHeaders.Add("Authorization", "Basic bGF3c2912XBANzg5ITppc2ltCzEF");
GET request with multiple params:
curl --request GET --url
http://localhost:8080/todos/?limit=10&offset=2 --header
'content-type:application/json'
You can also pass value directly via URL.
If you want to call method
public static void calling(string name){....}
then you should call usingHttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create("http://localhost:****/Report/calling?name=Priya);
webrequest.Method = "GET";
webrequest.ContentType = "application/text";
Just make sure you are using ?Object = value in URL
I am making an axios POST call to a tomcat servlet. I see the string being sent as Request payload when I check Developer tools but I am not able to retrieve the string in Tomcat servlet.
When I test it with PHP, I am able to retrieve the json string.
$json_str = file_get_contents('php://input');
echo $json_str; //This works and displays the JSON string
This is what I have tried in the servlet, please let me know what might be wrong with my code.
VueJs axios
axios({
method: 'post',
url: urltocall,
data: this.strjson,
params: {
'username': 'test1'
},
config: {
headers: {
'Access-Control-Allow-Origin': 'http://localhost:1337',
'Accept': 'application/json',
'Content-Type': 'application/json'
}
}
})
.then(function (response) { }
Tomcat Servlet
StringBuilder sb = new StringBuilder();
BufferedReader br = request.getReader();
String str;
while( (str = br.readLine()) != null ){ //Not entering this while loop, so "sb" is empty
sb.append(str);
}
"content-length' when checked in the servlet, shows the correct length of the string passed through "data", so that confirms that the string is available in the request object. But for some strange reason, the getReader() is not fetching the string.
Appreciate your help.
I found the issue. I was reading a parameter from request object before using the getReader() to extract the data. That was causing the data to be wiped out. When I shifted the getReader() to top, to give it the 1st access of info in request object, it worked just fine. Trivial fix but cost some time. Hope this helps someone.
Wrong
String test = request.getParameter("test");
StringBuilder sb = new StringBuilder();
BufferedReader br = request.getReader();
String str;
while( (str = br.readLine()) != null ){
sb.append(str);
}
Right
StringBuilder sb = new StringBuilder();
BufferedReader br = request.getReader();
String str;
while( (str = br.readLine()) != null ){
sb.append(str);
}
String test = request.getParameter("test");
I know there are many different situations that resemble mine across stackoverflow, but I just couldn't make the connection.
What I am trying to do, is to send a simple push notification to the GCM. I found two links for which I try to POST too. Note both these links work in this PHP script i found.
https://gcm-http.googleapis.com/gcm/send
https://android.googleapis.com/gcm/send
I tried to send push notifications from JS to the GCM, but many people have stated that this can not because of security issues. As of now, when I execute my code in Angular JS, I am getting a 405 error from https://gcm-http.googleapis.com/gcm/send. Status 405 means method not accepted (link for reference http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html).
Here is the code for JS. I have two method that I tried.
Method 1:
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
//ite
}
};
var jsonCall = {
registration_id: "xxxxxxxxxxxxxxxxxxxxxxxxxxxx-AEQtUUWnCVH566xcwib4HinI16W3_g"
};
xmlhttp.open("POST", "https://gcm-http.googleapis.com/gcm/send", true);
xmlhttp.setRequestHeader("Content-type", "application/json");
xmlhttp.setRequestHeader("Authorization", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
xmlhttp.send(jsonCall);
Method 2
var jsonCall = {
registration_id: "xxxxxxxxxxxxxxxxxxxxxxxxxxxx-AEQtUUWnCVH566xcwib4HinI16W3_g"
};
$http({
method:'POST',
url: 'https://gcm-http.googleapis.com/gcm/send',
data: jsonCall,
headers: {
'Authorization': 'A1nxxxxxxxxxxxxxxxxxx',
'Content-type': 'application/json' }
})
This is what I have tried in Java. Note that my project was not created as an Android project, but just as a normal Java project. I get a 411 error here, so I think the string I use as JSON is incorrect. Note that I get a 200 if I use GET.
Method 3:
HttpURLConnection connection = null;
try {
//Create connection
String json ="{\"registration_ids\":[\"xxxxxxxxxxxxxxxxxxxxxxxxxxxxx-xxxxxxxxxxxxx\"]}";
URL url = new URL("https://gcm-http.googleapis.com/gcm/send");
connection = (HttpURLConnection)url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
connection.setRequestProperty("Content-Length", "0");
connection.setRequestProperty("Authorization", "key="+"xxxxxxxxxxxxxxxxxxxxxxxxxx");
System.out.println(connection.getResponseCode());
InputStream stream = (InputStream) connection.getInputStream();
InputStreamReader isReader = new InputStreamReader(stream);
//put output stream into a string
BufferedReader br = new BufferedReader(isReader);
String line;
while((line = br.readLine()) != null){
System.out.println(line);
}
OutputStream os = connection.getOutputStream();
os.write(json.getBytes("UTF-8"));
os.flush();
os.close();
} catch(Exception e){
System.out.println(e);
}
If someone can take a look at this, and set me in the correct direction, I would really appreciate it.
UPDATE:
I have gotten rid of that 411 error. I think it was because I never connected in the first place. Now I am getting the correct 200 code, but the push notification does not send. Is my JSON the correct format?
HttpURLConnection connection = null;
try {
//Create connection
String json ="{\"registration_ids\":[\"APA91bGxHWapgmxgyvPceu85ArDMLaFekbTt5RGzy3gv1xtSO09tJbvnaeVLefBqNl_iBrctoZQ2AltSMfrXykq8-AEQtUUWnCVH566xcwib4HinI16W3_g\"]}";
URL url = new URL("https://gcm-http.googleapis.com/gcm/send");
connection = (HttpURLConnection)url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestProperty("Authorization", "key=xxxxxxxxxxxxxxxxxxxxxxx");
connection.connect();
OutputStream os = connection.getOutputStream();
os.write(json.getBytes("UTF-8"));
System.out.println(connection.getResponseCode());
InputStream stream = (InputStream) connection.getInputStream();
InputStreamReader isReader = new InputStreamReader(stream);
//put output stream into a string
BufferedReader br = new BufferedReader(isReader);
String line;
while((line = br.readLine()) != null){
System.out.println(line);
}
os.flush();
os.close();
} catch(Exception e){
System.out.println(e);
}
This has been solved using the Java method. JS keeps on returning those status codes of 400, 401, 411 etc. It turns out the reason Java returned a 200 but my phone did not receive anything was because my JSON was incorrect. Here is the correct JSON value:
String postData = "{ \"registration_ids\": [ \"" + CLIENT_REG_ID + "\" ], " +
"\"delay_while_idle\": true, " +
"\"data\": {\"tickerText\":\"My Ticket\", " +
"\"contentTitle\":\"My Title\", " +
"\"message\": \"Test GCM message from GCMServer-Android\"}}";
This was obtained from another question I posted, where a fellow SO member provided this solution.
I have built a REST API with a controller having a POST method with 4 parameters like this-
[HttpPost]
public void SaveSession([FromBody] string userId, [FromBody] DateTime issueDateTime, [FromBody] string browserType, [FromBody] string salt)
{
// Params need to be changed
_sessionService.SaveSession(userId, issueDateTime, browserType, salt);
}
How should I POST data on the client side, I mean what should be the format of the data to be sent?
I tried this format-
"userId=abc&DateTime=someDatetime&browserType=somebrowser&salt=somesalt"
Its not working if I try this, The web service method is not even being called
Could anyone tell me the correct format?
EDIT:
Here is how I am calling the API-
const string endPoint = #"http://localhost:85/session/Test";
var postData = "userId=abc&DateTime=someDatetime&browserType=somebrowser&salt=somesalt"
var request = (HttpWebRequest) WebRequest.Create(EndPoint + parameters);
request.Method = "POST";
request.ContentLength = 0;
request.ContentType = "application/x-www-form-urlencoded";
if (!string.IsNullOrEmpty(postData) && Method == HttpVerb.POST)
{
var encoding = new UTF8Encoding();
var bytes = Encoding.GetEncoding("iso-8859-1").GetBytes(postData);
request.ContentLength = bytes.Length;
using (var writeStream = request.GetRequestStream())
{
writeStream.Write(bytes, 0, bytes.Length);
}
}
using (var response = (HttpWebResponse) request.GetResponse())
{
var xmlDoc = new XmlDocument();
if (response.StatusCode != HttpStatusCode.OK)
{
var message = String.Format("Request failed. Received HTTP {0}", response.StatusCode);
throw new ApplicationException(message);
}
// grab the response
var responseStream = response.GetResponseStream();
if (responseStream != null)
{
xmlDoc.Load(responseStream);
}
return (xmlDoc);
}
Thanks!
I assume routing has been properly configured.
Said so.... DateTime parameter in the controller method has been named "issueDateTime" while within the request has been named "DateTime".
I got to know, what mistake I was doing. I was sending 4 parameters in a WebService method. We can only send one parameter while calling a web service method. If you want to send multiple data, just send it as an object. Like this -
[HttpPost]
public void SaveSession([FromBody] Values value)
{
var userId = values.userId,
var issueDateTime= values.issueDateTime,
var browserType= values.browserType,
var salt= values.salt,
_sessionService.SaveSession(userId, issueDateTime, browserType, salt);
}
I have a flash as 2.0 file that i need to send emails via an asp handler. First off, is this possible? Second, if it is, how do i get the return to have a status=true?
the .net codebehind
public void ProcessRequest(HttpContext context)
{
//E-Mail Method
string response = "sent=success";
MailAddress fromAddress = new MailAddress(context.Request.QueryString["Email"].ToString(), context.Request.QueryString["Name"].ToString());
MailAddress toAddress = new MailAddress("emailInbox#site.com", "Goons");
MailMessage message = new MailMessage(fromAddress, toAddress);
message.Subject = context.Request.QueryString["Name"].ToString() + " sent you a message from the website.";
message.Body = context.Request.QueryString["Msg"].ToString();
SmtpClient client = new SmtpClient("mail.grassrootsdm.com");
// Include credentials if the server requires them.
NetworkCredential SMTPUserInfo = new NetworkCredential("mailsenderemail","password");
client.Credentials = SMTPUserInfo;
try {
client.Send(message);
}
catch (Exception ex) {
response = ex.ToString();
}
context.Response.Write(response);
}
the actionscript
if (i == 0) {
sendVars.Name = fieldName.field.text;
sendVars.Email = fieldEmail.field.text;
sendVars.Msg = fieldMsg.field.text;
sendVars.sendAndLoad("http://www.grassrootsdm.com/WebService/EmailHandler.ashx", statusVars, "POST");
statusMsg.text = "Sending...";
statusVars.onLoad = function(success:Boolean) {
if (success) {
if (statusVars.sent == "success") {
clearForm();
statusMsg.text = "Message sent";
}
} else {
statusMsg.text = "Error!";
}
clearInterval(clearStatus);
clearStatus = setInterval(clearStatusInt, 3000);
};
}
Yes, it is possible.
Read the important notes at the bottom of each codes pertain to sending and retrieving data from flash to .net page. Explanation of the code is in the comment inside the code.
Flash Part (Action Script 2)
//function to send invoke .net page to send email
//use other control/button to call this function
//important: in order for the 'onLoad' event to work correctly, this function has to be 'Void'
function sendMail():Void
{
//show status
statusMsg.text = "Sending...";
//create LoadVars object
var lv_in:LoadVars = new LoadVars();
var lv_out:LoadVars = new LoadVars();
//set onLoad event
lv_in.onLoad = function(success:Boolean)
{
//if success, meaning data has received from .net page, run this code
if (success)
{
//lv_in.sent is used to parsed out message/data from .Net page
statusMsg.text = "Message sent!" + lv_in.sent;
}
//if fail, run this code
else
{
statusMsg.text = "Error!";
}
}
//begin invoke .net page to send email
lv_out.sendAndLoad("SendMail.aspx", lv_in, "POST");
}
Important note:
The function that contain onLoad event, in this case sendMail function, has to be Void function, meaning it's not returning value. If this function return value, what happen is the function will be executed all the way without waiting for the data for the return data from .net page, thus the onLoad event will not be set properly.
.Net Part
I copied the OP's .Net code so assuming this code works when sending email.
public void ProcessRequest(HttpContext context)
{
//E-Mail Method
string response = "sent=Success&";
MailAddress fromAddress = new MailAddress(context.Request.QueryString["Email"].ToString(), context.Request.QueryString["Name"].ToString());
MailAddress toAddress = new MailAddress("emailInbox#site.com", "Goons");
MailMessage message = new MailMessage(fromAddress, toAddress);
message.Subject = context.Request.QueryString["Name"].ToString() + " sent you a message from the website.";
message.Body = context.Request.QueryString["Msg"].ToString();
SmtpClient client = new SmtpClient("mail.grassrootsdm.com");
// Include credentials if the server requires them.
NetworkCredential SMTPUserInfo = new NetworkCredential("mailsenderemail","password");
client.Credentials = SMTPUserInfo;
try
{
client.Send(message);
}
catch (Exception ex)
{
response = ex.ToString();
}
context.Response.Write(response);
}
Important note:
The only thing I changed from the OP's .Net code is the response message. It was originally "sent=success" which I changed to "sent=success&".
The reason for this is, if you want action script to parse the posted message/data from .Net, it will stop at & symbol, thus leave the rest of the message alone and only get the message under sent variable.