Send a custom error document for 404 Not Found ?

[Incus J 10]

In OverbyteIcsHttpServ, the error procedures such as THttpConnection.Answer404 are called from various places in the code and have hard coded HTML.  I'd like to serve my own error document instead.  Is there a built in mechanism to supply a custom HTML error document for errors such as 404, 403 ?

[Angus Robertson 591]

To send custom error responses you can create overloaded versions of Answer404, etc, in your version of THttpConnection or THttpAppSrvConnection.

 

Angus

 

[Incus J 10]

Perfect - I had missed the virtual nature of Answer404 - Thank you!

[nSolvePaul 0]

I tried to do exactly this.

i.e. I have created my own TManagersHttpConnection derived from THttpAppSrvConnection

 

class TManagersHttpConnection: public THttpAppSrvConnection
{
    typedef THttpAppSrvConnection inherited;
private:
protected:
    virtual void __fastcall Answer404();
public:
    __fastcall TManagersHttpConnection(Classes::TComponent* AOwner);
};

 

 

I then told the OverbyteIcsHttpServ that ClientClass to use is the above one:

 

__fastcall TnManagersHttpAppServer::TnManagersHttpAppServer(Classes::TComponent * AOwner)
    : THttpAppSrv(AOwner)
{
    ClientClass = __classid(TManagersHttpConnection);

 

My TManagersHttpConnection constructor gets called when a new client connects, exactly as I expect.  Yet my Answer404() function does NOT get called for a missing file, instead the content served is that from the base THttpAppSrvConnection class.

 

What might I be doing wrong please?

 

 

FYI this is using ICS version:

Revised: September 27, 2021
Release: V8.67

With Borland C++ 2007

 

Which for various reasons is not viable to update.

 

 

[Angus Robertson 591]

If you are stuck using an old version, which is understandable for old compilers, why not just customise the Answer404 function?

 

Angus

 

[nSolvePaul 0]

Thanks for the alternative suggestion

 

In fact it does work just fine, I think as I was only calling  

  inherited::Answer404();

the compiler had optimized it out. 

Onwards and upwards now 🙂

[Angus Robertson 591]

The ICS web server should probably offer an event to make creating customised error pages easier, I've put it on the wish list.  Our error pages are very minimal. 

 

Angus