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#1 mORMot 2 » THttpClientSocket and fiddler » 2025-06-30 16:00:41

spanfkyous
Replies: 0

How should THttpClientSocket be configured to support a Fiddler Classic proxy?

For a standard HTTP proxy, the following configuration works correctly:

THttpClientSocket.Tunnel.From('http://proxyserver:port');

With this setup, both HTTP and HTTPS requests go through the proxy without issues.

However, when using Fiddler Classic as the proxy (e.g., http://127.0.0.1:8888), the same configuration only works for HTTP websites. HTTPS requests fail to connect through the proxy. The proxy is still set using:

THttpClientSocket.Tunnel.From('http://127.0.0.1:8888');


fiddler classic: https://www.telerik.com/fiddler/fiddler-classic , fiddler was run with decrypt ssl option active.
active SSL decryption from here: tools->options->HTTPS->Capture Https /Decrypt Https SSL

#2 Re: mORMot 2 » dns custom for http client » 2025-06-05 13:02:44

spanfkyous

Previously, I used Oberbyte ICS as the HTTP client, but unfortunately it doesn't support Lazarus, so I switched to mORMot.

There is an event in ICS's THttpCli：
    TSelectDnsEvent = procedure(Sender : TObject;  DnsList     : TStrings;    var NewDns  : String) of object;
ref:https://svn.overbyte.be/svn/ics/trunk/Source/OverbyteIcsHttpProt.pas

This event will be triggered when the DNS resolve is done.
DnsList stores all IP addresses resolved by DNS, NewDns is the IP address selected by THttpCli to do future connection, I can modify it in the event.

#3 Re: mORMot 2 » dns custom for http client » 2025-06-05 02:25:56

spanfkyous

Thank you.

I looked into RegisterKnownHost, and it maps a specific domain name to a specific IP address.
What I actually want is to block certain IP addresses.
Let me give a more specific example: for test.com, if it resolves to 1.1.2.2, I want to avoid selecting it as the socket ip destination. But if it resolves to other IPs by DNS, I want to allow them and not processed.

#4 mORMot 2 » dns custom for http client » 2025-06-04 17:16:13

spanfkyous
Replies: 4

Hi,

Does mORMot2 support custom DNS? I want to select a suitable IP address for the Http Client in code.

For example: test.com resolves to 1.1.2.2 (which is either a faulty service or unreachable due to network issues) and 1.1.1.1 (which is still available).

In the current implementation, openbind seems connect to the first resolved address from the system, and there's no way to temporarily exclude 1.1.2.2 through code.

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