Title may be unclear, forgive me. I believe this is a client-side problem and I'm not really familiar enough with websockets. I can successfully initialize my web page with a message from my c++ server by sending concatenated string of following:
HTTP header
const char * http_header = "HTTP/1.1 200 OK\r\n"
"Content-length: %ld\r\n"
"Content-Type: text/html\r\n"
"\r\n"
"%s";
Page Source
const char * html_source = R"(<html lang='en'>
<head>
<meta charset='UTF-8'>
<meta name='viewport' content='width = device-width, initial-scale = 1.0'>
<meta http-equiv='X-UA-Compatible' content = 'ie=edge'>
...
MY PAGE CODE GOES HERE
...
</script>
</body>
</html>)";
Transmission loop
char browser_init[strlen(http_header)+strlen(html_source)];
sprintf(browser_init,http_header,strlen(html_source),html_source);
const char * test_message = "a";
while(true)
{
if(ping_count == 0){
connection_status = 3;
recv(client_socket,client_message,sizeof(client_message),0);
send(client_socket,browser_init,sizeof(browser_init),0);
std::this_thread::sleep_for(std::chrono::milliseconds(1000));
}
if(ping_count>0){
if(send(client_socket,test_message,sizeof(test_message),0)){
connection_status = 2;
}
if(!send(client_socket,test_message,sizeof(test_message),0)){
connection_status = 1;
std::cout<<"Connection failed";
}
std::this_thread::sleep_for(std::chrono::milliseconds(1000));
}
ping_count++;
}
This first message is successfully initializing my webpage on browser but I cannot receive following ones.
I tried adding the code below inside <script> , I no longer see my javascript content and Firefox status bar says : Transferring data from localhost (page is continuously loading)
var ws = require("nodejs-websocket");
var client = ws.createServer(function(conn){
console.log("New Connection");
conn.on("message",function(str){
console.log(str);
}).listen(12000,'127.0.0.1');
});
I'm literally sitting here and waiting for help at this point
Related
I'm trying to follow this example to let me make a POST request to a web server and receive its response in pure C++ using Core Foundation functions. I'll copy and paste it here:
void PostRequest()
{
// Create the POST request payload.
CFStringRef payloadString = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("{\"test-data-key\" : \"test-data-value\"}"));
CFDataRef payloadData = CFStringCreateExternalRepresentation(kCFAllocatorDefault, payloadString, kCFStringEncodingUTF8, 0);
CFRelease(payloadString);
//create request
CFURLRef theURL = CFURLCreateWithString(kCFAllocatorDefault, CFSTR("https://httpbin.org/post"), NULL); //https://httpbin.org/post returns post data
CFHTTPMessageRef request = CFHTTPMessageCreateRequest(kCFAllocatorDefault, CFSTR("POST"), theURL, kCFHTTPVersion1_1);
CFHTTPMessageSetBody(request, payloadData);
//add some headers
CFStringRef hostString = CFURLCopyHostName(theURL);
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("HOST"), hostString);
CFRelease(hostString);
CFRelease(theURL);
if (payloadData)
{
CFStringRef lengthString = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("%ld"), CFDataGetLength(payloadData));
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Content-Length"), lengthString);
CFRelease(lengthString);
}
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Content-Type"), CFSTR("charset=utf-8"));
//create read stream for response
CFReadStreamRef requestStream = CFReadStreamCreateForHTTPRequest(kCFAllocatorDefault, request);
CFRelease(request);
//set up on separate runloop (with own thread) to avoid blocking the UI
CFReadStreamScheduleWithRunLoop(requestStream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
CFOptionFlags optionFlags = (kCFStreamEventHasBytesAvailable | kCFStreamEventErrorOccurred | kCFStreamEventEndEncountered);
CFStreamClientContext clientContext = {0, (void *)payloadData, RetainSocketStreamHandle, ReleaseSocketStreamHandle, NULL};
CFReadStreamSetClient(requestStream, optionFlags, ReadStreamCallBack, &clientContext);
//start request
CFReadStreamOpen(requestStream);
if (payloadData)
{
CFRelease(payloadData);
}
}
And the callback:
void LogData(CFDataRef responseData)
{
CFIndex dataLength = CFDataGetLength(responseData);
UInt8 *bytes = (UInt8 *)malloc(dataLength);
CFDataGetBytes(responseData, CFRangeMake(0, CFDataGetLength(responseData)), bytes);
CFStringRef responseString = CFStringCreateWithBytes(kCFAllocatorDefault, bytes, dataLength, kCFStringEncodingUTF8, TRUE);
CFShow(responseString);
CFRelease(responseString);
free(bytes);
}
static void ReadStreamCallBack(CFReadStreamRef readStream, CFStreamEventType type, void *clientCallBackInfo)
{
CFDataRef passedInData = (CFDataRef)(clientCallBackInfo);
CFShow(CFSTR("Passed In Data:"));
LogData(passedInData);
//append data as we receive it
CFMutableDataRef responseBytes = CFDataCreateMutable(kCFAllocatorDefault, 0);
CFIndex numberOfBytesRead = 0;
do
{
UInt8 buf[1024];
numberOfBytesRead = CFReadStreamRead(readStream, buf, sizeof(buf));
if (numberOfBytesRead > 0)
{
CFDataAppendBytes(responseBytes, buf, numberOfBytesRead);
}
} while (numberOfBytesRead > 0);
//once all data is appended, package it all together - create a response from the response headers, and add the data received.
//note: just having the data received is not enough, you need to finish the response by retrieving the response headers here...
CFHTTPMessageRef response = (CFHTTPMessageRef)CFReadStreamCopyProperty(readStream, kCFStreamPropertyHTTPResponseHeader);
if (responseBytes)
{
if (response)
{
CFHTTPMessageSetBody(response, responseBytes);
}
CFRelease(responseBytes);
}
//close and cleanup
CFReadStreamClose(readStream);
CFReadStreamUnscheduleFromRunLoop(readStream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
CFRelease(readStream);
//just keep the response body and release requests
CFDataRef responseBodyData = CFHTTPMessageCopyBody(response);
if (response)
{
CFRelease(response);
}
//get the response as a string
if (responseBodyData)
{
CFShow(CFSTR("\nResponse Data:"));
LogData(responseBodyData);
CFRelease(responseBodyData);
}
}
I understood how it works, and started implementing it ..... only to get this error:
'CFReadStreamCreateForHTTPRequest' is deprecated: first deprecated in
macOS 10.11 - Use NSURLSession API for http requests
There's absolutely zero examples how to use NSURLSession for C++, or how to bypass that idiotic "is deprecated" error.
Any help on how am I supposed to code this in C++ now?
PS. I don't want to use any third-party libraries. This is a simple task that was available with simple API calls (as I showed above.)
PS2. Sorry I am not an Apple developer, and I'm not used to features being deprecated on the whim.
There are 3 options.
Ignore the warning.
Use ObjC runtme.
Use libcurl
The first one is the easiest and the second one is the hardest solutions for your skills. The third option is easy and the most advanced solution - if you extend you software with new features, CFNetwork will lack of functionality.
I have written a webservice using spring webflux and reactive mongodb connectors, but my client side could be non spring based client.
So, how do I write a plain java code to consume flex at client side?
ServerSide code:
#GetMapping(value = "/findAll")
public Flux<Security> findAll() {
Flux<Security> flux = service.findAll();
return flux;
}
Client side code:
public static void sendRequest() {
try {
long start = System.currentTimeMillis();
for (int i = 0; i <= 100; i++) {
long start1 = System.currentTimeMillis();
URL url = new URL("http://localhost:8080/findAll/");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/stream+json");
if (conn.getResponseCode() == 200) {
// url = new URL("http://localhost:8182/status/");
String json = "";
try (BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())))) {
json = br.lines().collect(Collectors.joining());
}
conn.disconnect();
System.out.println("size of each Security: " + json.length());
ArrayList<Security> list = getListOfsecurities(json);
System.out.println(list.get(0).getIsin());
}
}
The above client side gives me an empty array.
I don't think it is possible. It's an asynchronous response.At least you have to use Java 5 Futures to invoke asynchronous response.
I am using apache commons httpclient version 4.2 to execute a simple web service based on SOAP 1.2. I am able to fire the web service properly through SOAP UI but I am unable to do the same using Java.
Following is the method I'm using to invoke the service.
private static byte[] callSOAPServer(String body, String SOAP_ACTION,
String SERVER_URL) {
byte[] result = null;
HttpParams httpParameters = new BasicHttpParams();
// Set the timeout in milliseconds until a connection is established.
int timeoutConnection = 15000;
HttpConnectionParams.setConnectionTimeout(httpParameters,
timeoutConnection);
// Set the default socket timeout (SO_TIMEOUT)
// in milliseconds which is the timeout for waiting for data.
int timeoutSocket = 35000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
DefaultHttpClient httpclient = new DefaultHttpClient(httpParameters);
/*
* httpclient.getCredentialsProvider().setCredentials( new
* AuthScope("os.icloud.com", 80, null, "Digest"), new
* UsernamePasswordCredentials(username, password));
*/
HttpPost httppost = new HttpPost(SERVER_URL);
httppost.setHeader("soapaction", SOAP_ACTION);
httppost.setHeader("Content-Type", "text/xml; charset=utf-8");
System.out.println("executing request" + httppost.getRequestLine());
// now create a soap request message as follows:
final StringBuffer soap = new StringBuffer();
soap.append("\n");
soap.append("");
// this is a sample data..you have create your own required data BEGIN
soap.append(" \n");
soap.append(" \n");
soap.append("" + body);
soap.append(" \n");
soap.append(" \n");
/* soap.append(body); */
// END of MEssage Body
soap.append("");
System.out.println("SOAP Request : " + soap.toString());
// END of full SOAP request message
try {
HttpEntity entity = new StringEntity(soap.toString(), HTTP.UTF_8);
httppost.setEntity(entity);
HttpResponse response = httpclient.execute(httppost);// calling
// server
HttpEntity r_entity = response.getEntity(); // get response
System.out.println("Reponse Header:Begin..."); // response headers
System.out.println("Reponse Header StatusLine:"
+ response.getStatusLine());
Header[] headers = response.getAllHeaders();
for (Header h : headers) {
System.out.println("Reponse Header " + h.getName() + ": "
+ h.getValue());
}
System.out.println("Reponse Header END...");
if (r_entity != null) {
result = new byte[(int) r_entity.getContentLength()];
if (r_entity.isStreaming()) {
DataInputStream is = new DataInputStream(
r_entity.getContent());
is.readFully(result);
}
}
} catch (Exception E) {
System.out.println("Exception While Connecting " + E.getMessage());
E.printStackTrace();
}
httpclient.getConnectionManager().shutdown(); // shut down the
// connection
return result;
}
Following is my SOAP Request as well as the end point.
String soapRequest = "<soap:Envelope xmlns:soap=\"http://www.w3.org/2003/05/soap-envelope\" xmlns:typ=\"http://skash.service.sahaj.com/types/\">"
+ "<soap:Header/>"
+ "<soap:Body>"
+ "<typ:remoteSKASHDeductionElement>"
+ "<typ:vleId>?</typ:vleId>"
+ "<typ:paidAmt>?</typ:paidAmt>"
+ "<typ:refTxnId>?</typ:refTxnId>"
+ "</typ:remoteSKASHDeductionElement>"
+ "</soap:Body>"
+ "</soap:Envelope>";
String soapEndPoint = "http://xxx.xxx.xxx.xxx:xxxx/skashws/remoteSKASHDeductionSoap12HttpPort";
String soapAction = "http://xxx.xxx.xxx.xxx:xxxx//remoteSKASHDeduction";
// executeSOAPRequest(soapRequest, soapEndPoint, soapAction);
byte[] resp = callSOAPServer(soapRequest, soapAction, soapEndPoint);
System.out.println(IOUtils.toString(resp));
I can see that the namespace set to Envelope tag is for SOAP 1.2 and is well set. I am not sure where I'm going wrong. I am receiving the following version mismatch error.
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<env:Header>
<env:Upgrade>
<env:SupportedEnvelope xmlns:soap12="http://www.w3.org/2003/05/soap-envelope" qname="soap12:Envelope"/>
</env:Upgrade>
</env:Header>
<env:Body>
<env:Fault xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<faultcode>env:VersionMismatch</faultcode>
<faultstring>Version Mismatch</faultstring>
<faultactor>http://schemas.xmlsoap.org/soap/actor/next</faultactor>
</env:Fault>
</env:Body>
you may use this code block
public class GenericSoapMessageFactory extends SaajSoapMessageFactory implements InitializingBean {
#Override
public SaajSoapMessage createWebServiceMessage(InputStream inputStream) throws IOException {
setMessageFactoryForRequestContext(soap11);
if (inputStream instanceof TransportInputStream) {
TransportInputStream transportInputStream = (TransportInputStream) inputStream;
if (soapProtocolChooser.useSoap12(transportInputStream)) {
setMessageFactoryForRequestContext(soap12);
}
}
SaajSoapMessageFactory mf = getMessageFactoryForRequestContext();
return mf.createWebServiceMessage(inputStream);
}
}
And web.xml params
<servlet>
<servlet-name>spring-ws2</servlet-name>
<servlet-class>org.springframework.ws.transport.http.MessageDispatcherServlet</servlet-class>
<init-param>
<param-name>messageFactoryBeanName</param-name>
<param-value>genericSoapMessageFactory</param-value>
</init-param>
</servlet>
I saw this error once and I changed the following line;
httppost.setHeader("Content-Type", "text/xml; charset=utf-8");
to
httppost.setHeader("Content-Type", "application/soap+xml;charset=UTF-8;");
and it fixed the issue. Try it.
I am trying to send push notification in blackberry by using C# Web
service but i am facing problem is it return exception "The remote
server returned an error: (404) Not Found.". all info is correct as
per RIM Standard so please Help me ASAP.
[WebMethod]
public bool push(string notification)
{
bool success = true;
byte[] bytes = Encoding.ASCII.GetBytes("Hello");
Stream requestStream = null;
HttpWebResponse HttpWRes = null;
HttpWebRequest HttpWReq = null;
String BESName = "cp****.pushapi.eval.blackberry.com";
try
{
//http://<BESName>:<BESPort>/push?DESTINATTION=<PIN/EMAIL>&PORT=<PushPort>&REQUESTURI=/
// Build the URL to define our connection to the BES.
string httpURL = "https://" + BESName + "/push?DESTINATION=2B838E45&PORT=32721&REQUESTURI=/";
//make the connection
HttpWReq = (HttpWebRequest)WebRequest.Create(httpURL);
HttpWReq.Method = ("POST");
//add the headers nessecary for the push
HttpWReq.ContentType = "text/plain";
HttpWReq.ContentLength = bytes.Length;
// ******* Test this *******
HttpWReq.Headers.Add("X-Rim-Push-Id", "2B838E45" + "~" + DateTime.Now); //"~" +pushedMessage +
HttpWReq.Headers.Add("X-Rim-Push-Reliability", "application-preferred");
HttpWReq.Headers.Add("X-Rim-Push-NotifyURL", ("http://" + BESName + "2B838E45~Hello~" + DateTime.Now).Replace(" ", ""));
// *************************
HttpWReq.Credentials = new NetworkCredential("Username", "Password");
requestStream = HttpWReq.GetRequestStream();
//Write the data from the source
requestStream.Write(bytes, 0, bytes.Length);
//get the response
HttpWRes = (HttpWebResponse)HttpWReq.GetResponse();
var pushStatus = HttpWRes.Headers["X-RIM-Push-Status"];
//if the MDS received the push parameters correctly it will either respond with okay or accepted
if (HttpWRes.StatusCode == HttpStatusCode.OK || HttpWRes.StatusCode == HttpStatusCode.Accepted)
{
success = true;
}
else
{
success = false;
}
//Close the streams
HttpWRes.Close();
requestStream.Close();
}
catch (System.Exception)
{
success = false;
}
return success;
}
I got the same error when I tried your code above. Replace
String BESName = "cp****.pushapi.eval.blackberry.com";
With
String BESName = "cpxxx.pushapi.eval.blackberry.com/mss/PD_pushRequest";
and make sure you provide the right username and password here:
HttpWReq.Credentials = new NetworkCredential("username", "password");
I got success = true;
However, even though the above code executed successfully, I still do not see the push message on the BlackBerry device.
I am writing an arduino library to post http request on web.
I am using the String class from http://arduino.cc/en/Tutorial/TextString
My code is behaving strangely when I am referring to my defined string objects after a function call.
Here actually I am trying to get the body of my GET request and removing the http headers from the http GET request's response.
Following is the description:
Method Call:
String body;
if(pinger.Get(host,path,&body))
{
Serial.println("Modified String Outside :");
Serial.println(body);
Serial.println();
Serial.println("Modified String Outside Address");
Serial.println((int)&body);
}
Output
Modified String Outside :
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Content-Type: text/html
Content-Length: 113
Date: Wed, 13 Jan 2010 14:36:28 GMT
<html>
<head>
<title>Ashish Sharma
</title>
</head>
<body>
Wed Jan 13 20:06:28 IST 2010
</body>
</html>
Modified String Outside Address
2273
Method Description:
bool Pinger::Get(String host, String path, String *response) {
bool connection = false;
bool status = false;
String post1 = "GET ";
post1 = post1.append(path);
post1 = post1.append(" HTTP/1.1");
String host1 = "Host: ";
host1 = host1.append(host);
for (int i = 0; i < 10; i++) {
if (client.connect()) {
client.println(post1);
client.println(host1);
client.println();
connection = true;
break;
}
}
int nlCnt = 0;
while (connection) {
if (client.available()) {
int c = client.read();
response->append((char) c);
if (c == 0x000A && nlCnt == 0) {
nlCnt++;
if (response->contains("200")) {
status = true;
continue;
} else {
client.stop();
client.flush();
break;
}
}
}
if (!client.connected()) {
client.stop();
connection = false;
}
}
response = &response->substring(response->indexOf("\n\r\n"),response->length());
Serial.println("Modified String: ");
Serial.println(*response);
Serial.println();
Serial.print("Modified String Address: ");
Serial.println((int)&response);
return status;
}
Output:
Modified String:
Ø
<html>
<head>
<title>Ashish Sharma
</title>
</head>
<body>
Wed Jan 13 20:06:28 IST 2010
</body>
</html>
Modified String Address: 2259
As can be seen from the example the string reference object is giving me the correct string inside the Get method but the reference of the string contents change when the Get method returns.
If I understood correctly your code, you probably would want to do something like this:
*response = response->substring(response->indexOf("\n\r\n"),response->length());
instead of
response = &response->substring(response->indexOf("\n\r\n"),response->length());
Also there's probably no need to pass in a pointer ( reference would probably make the code look much nicer ).
First off, you are modyfying the address of the string, not the string itself. But the address of the string was passed to the function by value, and thus copied. Modifying it inside the function won’t modify it on the outside.
Secondly, this code here is bad:
response = &response->substring(response->indexOf("\n\r\n"),response->length());
Because it creates a pointer to a temporary object – which means: a dangling pointer because the temporary object will be destroyed after the expression has been evaluated.
What you really want is pass the object by reference (String& response) and modify it, not its pointer:
response = response->substring(response->indexOf("\n\r\n"),response->length());
This should work, provided the String class you use correctly overloads the behaviour of the assignment operator =.
The line
Serial.println((int)&response);
inside your function is wrong response is already a pointer (String * response), with &response you get the pointer to the pointer.
Change it to
Serial.println((int)response);
and you should get the same address as with
Serial.println((int)&body);
where body is a String and &body is the pointer to the string