HTTP Get command doesn't work in (GSM/WCDMA) dongle network. Gives an HTTP server unreachable error while executing it

Question

4DV16R6 HTTP Get command doesn't work in (GSM/WCDMA) dongle network whereas it smoothly runs over Ethernet/Wifi network. In dongle network, it gives "HTTP server unreachable" error when executing HTTP Get command.

I've also tested with IC TCP/IP command of 4DV16R6 (ie TCP_Open, TCP_Send,...) in the same (dongle network) - it just works fine.

Plus, I've also got a chance to test this on 4DV17 to the latest R2 release - same issue (HTTP server unreachable error). But in 4DV15 or all below versions - it is working fine.

It seems that from 4DV16 onwards some upgrades must have been the issue which is causing it...?

Apart from this, I tried to went an extra mile doing packet sniffing while executing HTTP Get command - strange that the issue occurs before sending any packets to the dest. server ie no packets were even sending for request but the error message "HTTP server unreachable" popped up.

Can somebody please figure out what's going on?

For testing I have used the simple HTTP Get codes:

C_TEXT(URLPic_t) URLPic_t:="http://www.4d.com/sites/all/themes/dimention/images/home/logo4D.jpg" ARRAY TEXT(HeaderNames_at;0) ARRAY TEXT(HeaderValues_at;0) C_PICTURE(Pic_i) $httpResponse:=HTTP Get(URLPic_t;Pic_i;HeaderNames_at;HeaderValues_at)

Update : Let me explain my few research on this so that it would help everyone to know what is happening.

I've also tested this on various networks (say Ethernet, WiFi or even mobile Hotspot). HTTP Get works fine over all these networks as they all have their physical (mac) addresses. But the problem in the (GSM/WCDMS) dongle network is that it doesn't have any physical (mac) address as this is a Cellular based device (modem) rather it has an IMEI no. like any other phone or modem has.

So my assumption is HTTP Get command is failing over cellular based devices network (or works OK over non-cellular devices like above).

I wonder if anyone could try this on any Cellular based device network and see the result.

Also, using phone's network (as a WIFI) from it's hotspot in PC would be pretty same case like you use your direct WIFI network of which it works successfuly. As the PC uses its WIFI interface (which have physical mac address) enabled in order to communicate packets and thus works OK in that way as well.

Though this is just an assumption from my finding it could be other reason that causing this issue (not sure)?

I hope now this will give a bit details about the real scenario that Im facing with any HTTP Client commands (say HTTP Get or HTTP Request) from 4Dv16 and higher versions.

Answer 1

I tried with 4Dv17 e 4Dv17r3 on UMTS and LTE and it works fine.

I can advise to check if there is a DNS problem on you GSM connection: you can check that using an ip address instead of host name in the url (but not on that url on 4d.com because it doesn't accept the ip)

Update : I found a fixed bug that could resolve your problem:

ACI0098213 'HTTP Get' command fails on Windows system and returns unexpectedly the error #30 ("HTTP Server unreachable") for some web sites.

cfr https://bugs.4d.fr/fixedbugslist?Version=17.0_HF3