WinBatch Tech Support Home

Database Search

If you can't find the information using the categories below, post a question over in our WinBatch Tech Support Forum.

TechHome

WIL Extenders
WinInet
plus
Samples from Users

Can't find the information you are looking for here? Then leave a message over on our WinBatch Tech Support Forum.

iHttpOpen Not Returning 404

 Keywords: iHttpOpen Not Returning 404 200

Question:

I'm writting a monitor program to see if our web server is ready to accept request by trying to resolve a URL of a known page. If the page is not found, then my program would send messages. Trying to use HTTPOpen() and never receive the 404 that I expected. Here is the test script. 
tophandle=iBegin(0,"","")
connecthandle=iHostConnect(tophandle, ThisHost,@HTTP,"", "")
datahandle=iHttpInit(connecthandle, "GET", Object, "",0)
If datahandle==0
   err=iGetLastError()
   Message("Last Error",err)
   iClose(tophandle)
   Exit
EndIf
myheader=StrCat("user_process: My cool app", @CRLF, "app_version: 12.0")
rslt=iHttpOpen(datahandle, "" , 0, 0)
Message("HTTPGet", "Response Code = %rslt%")
If rslt=="ERROR" || rslt!=200
   If rslt == "ERROR"
      errstr = "WinInet Error"
      rslt = iGetLastError()
   Else
      errstr = "HTTP Error"
   EndIf
   Message(errstr,rslt)
   iClose(tophandle)
   Exit
EndIf
xx=iReadData(datahandle, StrCat(ProgramPath, "HTTPGet.txt"))
iClose(datahandle)
iClose(connecthandle)
iClose(tophandle)
Message("All","Done")
Exit
When I intentionally mis-spell the URL, I still get a 200. and when I use iReadData, I get the following returned: <script src='Login.jsgz'></script>

Is there a better way to do this?

Answer:

Make sure that the server is in fact returning 404. Some websites report a "not found" error by returning a standard web page with a "200 OK" response code; this is known as a soft 404. Soft 404s are problematic for automated methods of discovering whether a link is broken.

Here is a code sample, that I put together that does return 404 from a server that actually returns a 404 error: 

;Load the Appropriate Extender
AddExtender("WWINT44I.DLL",0,"WWINT64I.DLL")

host = "www.barrons.com"
url = "/bie/articles/current/toc.htm"

tophandle=iBegin( 0, "", "" )
If tophandle==0
   err=iGetLastError( )
   Message( "iBegin Last Error", err )
   GoSub CLEANUP
   Exit
EndIf

connecthandle = iHostConnect( tophandle, host, @HTTP, "", "" )
err = iGetLastError( )
If connecthandle == 0
   err = iGetLastError( )
   Message( "iHostConnect Last Error", err )
   GoSub CLEANUP
   Exit
EndIf

datahandle = iHttpInit( connecthandle, "GET", url, "", 4 );Enable Keep Alive
If datahandle == 0
   err = iGetLastError( )
   Message( "iHttpInit Last Error", err )
   GoSub CLEANUP
   Exit
EndIf

rslt=iHttpOpen(datahandle, "" , 0, 0)
Pause('iHttpOpen',rslt)
Exit

:CLEANUP
If IsDefined( datahandle ) Then iClose( datahandle )
If IsDefined( connecthandle ) Then iClose( connecthandle )
If IsDefined( tophandle ) Then iClose( tophandle )
Return
Apparently you can use "Fetch as Google" (or other tools available on the web) to verify whether the URL is actually returning the correct code. Reference: https://support.google.com/webmasters/answer/181708?hl=en 
Article ID:   W18504

Filename:   iHTTPOpen Not Returning 404.txt
File Created: 2014:06:10:14:12:50
Last Updated: 2014:06:10:14:12:50