Re: Remote HTTP fetch from Server not working?
Hello,
I'm having a similar issue where my servlet can not reach a URL within
my company's intranet. My company has a proxy and firewall, but I've
written other servlets that don't have any issue reaching URLs on my
intranet. It's possible that gwt requires me to manually specify a
proxy, but I've noticed trying to use the java.net.Proxy class is
unsupported by appengine, and was wondering if anyone had other
methods of connecting. I will paste the code below, with the
exception. I've tried this in development mode and I've tried creating
a war and posting it to my company's sunone server. No luck either
way.
System.setProperty(http.proxyHost, my-company-proxy);
System.setProperty(http.proxyPort, 80);
String urlStr = http://my-company-intranet.com;;
try
{
StringWriter content = new StringWriter();
URL url = new URL(urlStr);
// Proxy proxy = new Proxy(Proxy.Type.HTTP, new
InetSocketAddress(my-company-proxy.com, 80));
URLConnection spoof = url.openConnection();
InputStream i = spoof.getInputStream();
spoof.setRequestProperty(User-Agent, Mozilla/4.0
(compatible; MSIE 5.5; Windows NT 5.0; H010818) );
InputStreamReader isr = new InputStreamReader(i);
BufferedReader in = new BufferedReader(isr);
and the exception is...
Initializing AppEngine server
The server is running at http://localhost:/
java.io.IOException: Could not fetch URL: http://my-company-intranet.com
at
com.google.appengine.api.urlfetch.URLFetchServiceImpl.handleApplicationException(URLFetchServiceImpl.java:
75)
at
com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:
45)
at
com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler
$Connection.fetchResponse(URLFetchServiceStreamHandler.java:409)
at
com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler
$Connection.getInputStream(URLFetchServiceStreamHandler.java:290)
at
myproject.server.search.GreetingServiceImpl.getURLTextContent(GreetingServiceImpl.java:
118)
at
myproject.server.search.GreetingServiceImpl.greetServer(GreetingServiceImpl.java:
50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:
100)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:
562)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
188)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
224)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1093)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
121)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
360)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
at
Re: Remote HTTP fetch from Server not working?
If you're not actually deploying to the App Engine environment you can
remove the GAE class restrictions in the GWT plugin options and use
whatever classes you want.
On Mar 16, 10:09 pm, vegbenz veggieb...@gmail.com wrote:
So I discovered that I need to add any extra libraries into /war/WEB-
INF/lib -- added apache httpclient, apache logging, and apache codec
jars.
Now I get this error ---
java.net.Socket is a restricted class. Please see the Google App
Engine developer's guide
But the gwt docs seem to suggest i can use anything i want on the
server side:
Tip: Although GWT translates Java into JavaScript for client-side
code, GWT does not meddle with your ability to run Java bytecode on
your server whatsoever. Server-side code doesn't need to be
translatable, so you're free to use any Java library you find useful.
Well this one would be useful... any ideas why it is a restricted
class? and what that means?
Anecdotally i saw that I should be able to use URLConnection? I guess
I'll try that.
Thanks!
On Mar 16, 11:43 am, vegbenz veggieb...@gmail.com wrote:
Hi, when i run the code below as standalone pojo, it works fine, but
in my GreetingServiceImpl on server it returns 500 error;
** please note i DO want to do this from the server. i saw the
tutorial about adding script tags to accomplish this from the client.
I need to do the fetch from the server side for other reasons.
thanks!
import java.io.IOException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class TestRemoteCall {
public static void main(String args[]) {
HttpClient client = new HttpClient();
GetMethod method = new
GetMethod(http://waterdata.usgs.gov/tx/nwis/
current/?
type=flowgroup_key=basin_cdsearch_site_no_station_nm=barton);
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new
DefaultHttpMethodRetryHandler(3, false));
try {
// Execute the method.
int statusCode = client.executeMethod(method);
if (statusCode != HttpStatus.SC_OK) {
System.err.println(Method failed: +
method.getStatusLine());
}
// Read the response body.
byte[] responseBody = method.getResponseBody();
// Deal with the response.
// Use caution: ensure correct character encoding
and is not binary
data
// System.out.println(new
String(responseBody));
System.out.println(new String(responseBody));
} catch (HttpException he) {
System.err.println(Fatal protocol violation: +
he.getMessage());
he.printStackTrace();
} catch (IOException e) {
System.err.println(Fatal transport error: +
e.getMessage());
e.printStackTrace();
} finally {
// Release the connection.
method.releaseConnection();
}
}
}
HERE is the error message
import java.io.IOException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class TestRemoteCall {
public static void main(String args[]) {
HttpClient client = new HttpClient();
GetMethod method = new
GetMethod(http://waterdata.usgs.gov/tx/nwis/
current/?
type=flowgroup_key=basin_cdsearch_site_no_station_nm=barton);
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new
DefaultHttpMethodRetryHandler(3, false));
try {
// Execute the method.
int statusCode = client.executeMethod(method);
if (statusCode != HttpStatus.SC_OK) {
System.err.println(Method failed: +
method.getStatusLine());
}
// Read the response body.
byte[]
Remote HTTP fetch from Server not working?
Hi, when i run the code below as standalone pojo, it works fine, but
in my GreetingServiceImpl on server it returns 500 error;
** please note i DO want to do this from the server. i saw the
tutorial about adding script tags to accomplish this from the client.
I need to do the fetch from the server side for other reasons.
thanks!
import java.io.IOException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class TestRemoteCall {
public static void main(String args[]) {
HttpClient client = new HttpClient();
GetMethod method = new
GetMethod(http://waterdata.usgs.gov/tx/nwis/
current/?
type=flowgroup_key=basin_cdsearch_site_no_station_nm=barton);
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
new
DefaultHttpMethodRetryHandler(3, false));
try {
// Execute the method.
int statusCode = client.executeMethod(method);
if (statusCode != HttpStatus.SC_OK) {
System.err.println(Method failed: +
method.getStatusLine());
}
// Read the response body.
byte[] responseBody = method.getResponseBody();
// Deal with the response.
// Use caution: ensure correct character encoding and
is not binary
data
// System.out.println(new String(responseBody));
System.out.println(new String(responseBody));
} catch (HttpException he) {
System.err.println(Fatal protocol violation: +
he.getMessage());
he.printStackTrace();
} catch (IOException e) {
System.err.println(Fatal transport error: +
e.getMessage());
e.printStackTrace();
} finally {
// Release the connection.
method.releaseConnection();
}
}
}
HERE is the error message
import java.io.IOException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class TestRemoteCall {
public static void main(String args[]) {
HttpClient client = new HttpClient();
GetMethod method = new
GetMethod(http://waterdata.usgs.gov/tx/nwis/
current/?
type=flowgroup_key=basin_cdsearch_site_no_station_nm=barton);
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
new
DefaultHttpMethodRetryHandler(3, false));
try {
// Execute the method.
int statusCode = client.executeMethod(method);
if (statusCode != HttpStatus.SC_OK) {
System.err.println(Method failed: +
method.getStatusLine());
}
// Read the response body.
byte[] responseBody = method.getResponseBody();
// Deal with the response.
// Use caution: ensure correct character encoding and
is not binary
data
// System.out.println(new String(responseBody));
System.out.println(new String(responseBody));
} catch (HttpException he) {
System.err.println(Fatal protocol violation: +
he.getMessage());
he.printStackTrace();
} catch (IOException e) {
System.err.println(Fatal transport error: +
e.getMessage());
e.printStackTrace();
} finally {
// Release the connection.
method.releaseConnection();
}
}
}
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Re: Remote HTTP fetch from Server not working?
So I discovered that I need to add any extra libraries into /war/WEB-
INF/lib -- added apache httpclient, apache logging, and apache codec
jars.
Now I get this error ---
java.net.Socket is a restricted class. Please see the Google App
Engine developer's guide
But the gwt docs seem to suggest i can use anything i want on the
server side:
Tip: Although GWT translates Java into JavaScript for client-side
code, GWT does not meddle with your ability to run Java bytecode on
your server whatsoever. Server-side code doesn't need to be
translatable, so you're free to use any Java library you find useful.
Well this one would be useful... any ideas why it is a restricted
class? and what that means?
Anecdotally i saw that I should be able to use URLConnection? I guess
I'll try that.
Thanks!
On Mar 16, 11:43 am, vegbenz veggieb...@gmail.com wrote:
Hi, when i run the code below as standalone pojo, it works fine, but
in my GreetingServiceImpl on server it returns 500 error;
** please note i DO want to do this from the server. i saw the
tutorial about adding script tags to accomplish this from the client.
I need to do the fetch from the server side for other reasons.
thanks!
import java.io.IOException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class TestRemoteCall {
public static void main(String args[]) {
HttpClient client = new HttpClient();
GetMethod method = new
GetMethod(http://waterdata.usgs.gov/tx/nwis/
current/?
type=flowgroup_key=basin_cdsearch_site_no_station_nm=barton);
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new
DefaultHttpMethodRetryHandler(3, false));
try {
// Execute the method.
int statusCode = client.executeMethod(method);
if (statusCode != HttpStatus.SC_OK) {
System.err.println(Method failed: +
method.getStatusLine());
}
// Read the response body.
byte[] responseBody = method.getResponseBody();
// Deal with the response.
// Use caution: ensure correct character encoding and
is not binary
data
// System.out.println(new String(responseBody));
System.out.println(new String(responseBody));
} catch (HttpException he) {
System.err.println(Fatal protocol violation: +
he.getMessage());
he.printStackTrace();
} catch (IOException e) {
System.err.println(Fatal transport error: +
e.getMessage());
e.printStackTrace();
} finally {
// Release the connection.
method.releaseConnection();
}
}
}
HERE is the error message
import java.io.IOException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class TestRemoteCall {
public static void main(String args[]) {
HttpClient client = new HttpClient();
GetMethod method = new
GetMethod(http://waterdata.usgs.gov/tx/nwis/
current/?
type=flowgroup_key=basin_cdsearch_site_no_station_nm=barton);
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new
DefaultHttpMethodRetryHandler(3, false));
try {
// Execute the method.
int statusCode = client.executeMethod(method);
if (statusCode != HttpStatus.SC_OK) {
System.err.println(Method failed: +
method.getStatusLine());
}
// Read the response body.
byte[] responseBody = method.getResponseBody();
// Deal with the response.
// Use caution: ensure correct character encoding and
is not binary
data
// System.out.println(new String(responseBody));
System.out.println(new
Re: Remote HTTP fetch from Server not working?
figured it out ! so for the benefit of anybody searching for this
problem in the future, here you go:
try {
java.net.URL url = new URL(input);
java.net.URLConnection urlConn = url.openConnection();
urlConn.getContent();
int c;
StringBuilder sb = new StringBuilder();
InputStream stream = urlConn.getInputStream();
int i = urlConn.getContentLength();
while (((c=stream.read())!=-1)){// (--i 0){
System.out.print((char)c);
sb.append((char)c);
}
stream.close();
return sb.toString();
}
catch (java.io.IOException ioe)
{
ioe.printStackTrace();
}
return null;
On Mar 16, 9:09 pm, vegbenz veggieb...@gmail.com wrote:
So I discovered that I need to add any extra libraries into /war/WEB-
INF/lib -- added apache httpclient, apache logging, and apache codec
jars.
Now I get this error ---
java.net.Socket is a restricted class. Please see the Google App
Engine developer's guide
But the gwt docs seem to suggest i can use anything i want on the
server side:
Tip: Although GWT translates Java into JavaScript for client-side
code, GWT does not meddle with your ability to run Java bytecode on
your server whatsoever. Server-side code doesn't need to be
translatable, so you're free to use any Java library you find useful.
Well this one would be useful... any ideas why it is a restricted
class? and what that means?
Anecdotally i saw that I should be able to use URLConnection? I guess
I'll try that.
Thanks!
On Mar 16, 11:43 am, vegbenz veggieb...@gmail.com wrote:
Hi, when i run the code below as standalone pojo, it works fine, but
in my GreetingServiceImpl on server it returns 500 error;
** please note i DO want to do this from the server. i saw the
tutorial about adding script tags to accomplish this from the client.
I need to do the fetch from the server side for other reasons.
thanks!
import java.io.IOException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class TestRemoteCall {
public static void main(String args[]) {
HttpClient client = new HttpClient();
GetMethod method = new
GetMethod(http://waterdata.usgs.gov/tx/nwis/
current/?
type=flowgroup_key=basin_cdsearch_site_no_station_nm=barton);
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new
DefaultHttpMethodRetryHandler(3, false));
try {
// Execute the method.
int statusCode = client.executeMethod(method);
if (statusCode != HttpStatus.SC_OK) {
System.err.println(Method failed: +
method.getStatusLine());
}
// Read the response body.
byte[] responseBody = method.getResponseBody();
// Deal with the response.
// Use caution: ensure correct character encoding
and is not binary
data
// System.out.println(new
String(responseBody));
System.out.println(new String(responseBody));
} catch (HttpException he) {
System.err.println(Fatal protocol violation: +
he.getMessage());
he.printStackTrace();
} catch (IOException e) {
System.err.println(Fatal transport error: +
e.getMessage());
e.printStackTrace();
} finally {
// Release the connection.
method.releaseConnection();
}
}
}
HERE is the error message
import java.io.IOException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class TestRemoteCall {
public static void main(String args[]) {
