Hi, I currently need to implement an HTTP data transmission from an Arduino with WiFi module to a PC running a Tomcat 8.5.4 instance. The Tomcat is running under Ubuntu 16.04.
The problem is that, since there are no HTTP libraries on Arduino, I
need to write the correct HTTP request myself and I got stuck. It would
be great if someone on the list with a deeper understanding of the HTTP
protocol would be willing to support me.
The transmitted (possibly erroneous ) request looks like:
========================================
GET /push?VIN=testrun HTTP/1.1
User-Agent: Freematics
Connection: keep-alive
Host:
========================================
The server runs under a local access point IP (10.42.0.1) and receives
that request correctly but throws me an EOFException from the following
code fragment:
nRead = channel.read(socketBufferHandler.getReadBuffer());
if (nRead == -1) {
throw new EOFException();
}
So it seems to me that an end of file is reached before it is expected.
Can somebody provide me with hints on how to solve that issue and
formulate a correct HTTP request to my Tomcat instance?
The following is th log trace I receive from the server:
========================================
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
o.a.coyote.http11.Http11InputBuffer : Received [GET
/push?VIN=testrun HTTP/1.1
User-Agent: Freematics
Connection: keep-alive
Host:
]
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
o.a.c.authenticator.AuthenticatorBase : Security checking request GET
/push
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
org.apache.catalina.realm.RealmBase : No applicable constraints
defined
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
o.a.c.authenticator.AuthenticatorBase : Not subject to any constraint
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
org.apache.tomcat.util.http.Parameters : Set encoding to UTF-8
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
org.apache.tomcat.util.http.Parameters : Decoding query null UTF-8
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
org.apache.tomcat.util.http.Parameters : Start processing with input
[VIN=testrun]
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
o.s.b.w.f.OrderedRequestContextFilter : Bound request context to
thread: org.apache.catalina.connector.RequestFacade@75c83bc4
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
o.s.web.servlet.DispatcherServlet : DispatcherServlet with name
'dispatcherServlet' processing GET request for [/push]
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
s.w.s.m.m.a.RequestMappingHandlerMapping : Looking up handler method for
path /push
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
s.w.s.m.m.a.RequestMappingHandlerMapping : Returning handler method
[public void de.cyface.obd2.controller.Obd2Controller.push()]
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
o.s.b.f.s.DefaultListableBeanFactory : Returning cached instance of
singleton bean 'obd2Controller'
2016-09-05 13:32:50.238 DEBUG 13143 --- [nio-8080-exec-1]
o.s.web.servlet.DispatcherServlet : Last-Modified value for
[/push] is: -1
push
2016-09-05 13:32:50.239 DEBUG 13143 --- [nio-8080-exec-1]
o.s.web.servlet.DispatcherServlet : Null ModelAndView returned to
DispatcherServlet with name 'dispatcherServlet': assuming HandlerAdapter
completed request handling
2016-09-05 13:32:50.239 DEBUG 13143 --- [nio-8080-exec-1]
o.s.web.servlet.DispatcherServlet : Successfully completed request
2016-09-05 13:32:50.239 DEBUG 13143 --- [nio-8080-exec-1]
o.s.b.w.f.OrderedRequestContextFilter : Cleared thread-bound request
context: org.apache.catalina.connector.RequestFacade@75c83bc4
2016-09-05 13:32:50.239 DEBUG 13143 --- [nio-8080-exec-1]
o.apache.coyote.http11.Http11Processor : Socket:
[org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper@2940dec1:org.apache.tomcat.util.net.NioChannel@34a92297:java.nio.channels.SocketChannel[connected
local=/10.42.0.1:8080 remote=/10.42.0.72:46701]], Status in:
[OPEN_READ], State out: [OPEN]
2016-09-05 13:32:55.280 DEBUG 13143 --- [nio-8080-exec-2]
o.apache.coyote.http11.Http11Processor : Error parsing HTTP request header
java.io.EOFException: null
at
org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.fillReadBuffer(NioEndpoint.java:1222)
~[tomcat-embed-core-8.5.4.jar:8.5.4]
at
org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.read(NioEndpoint.java:1163)
~[tomcat-embed-core-8.5.4.jar:8.5.4]
at
org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:742)
~[tomcat-embed-core-8.5.4.jar:8.5.4]
at
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:404)
~[tomcat-embed-core-8.5.4.jar:8.5.4]
at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:994)
~[tomcat-embed-core-8.5.4.jar:8.5.4]
at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
[tomcat-embed-core-8.5.4.jar:8.5.4]
at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:785)
[tomcat-embed-core-8.5.4.jar:8.5.4]
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1425)
[tomcat-embed-core-8.5.4.jar:8.5.4]
at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
[tomcat-embed-core-8.5.4.jar:8.5.4]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[na:1.8.0_91]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[na:1.8.0_91]
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
[tomcat-embed-core-8.5.4.jar:8.5.4]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]
=======================================
Thanks and regards
Klemens
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