TIdHTTP to TNetHTTPRequest

[msd 5]

Hello developers, 

 

I need small expert assistance for translating old TIdHTTP requests to new TNetHTTPRequest.

 

I have one function for Get and one function for Post, but credentials in the header do not have the same logic, and if someone can translate it to a new TNetHTTPRequest way of web service connection?

 

function appGetData(API): boolean;
var
  Url: string;
  lHTTP: TIdHTTP;
  xml: IXMLDocument;
  XmlRS, HttpRS, HttpRC: string;
begin
  HttpRC := '';
  HttpRS := '';
  if Port = '' then
    Url := dm.apiHttp + '://' + dm.Server + '/api' + API
  else
    Url := dm.apiHttp + '://' + dm.Server + ':' + dm.Port + '/api' + API;
  try
    lHTTP := TIdHTTP.Create;
    try
      lHTTP.Request.Clear;
      lHTTP.Request.BasicAuthentication := true;
      lHTTP.Request.Accept := 'application/xml';
      lHTTP.Request.UserName := dm.UserName;
      lHTTP.Request.Password := dm.Password;
      lHTTP.Request.ContentEncoding := 'utf-8';
      lHTTP.Request.UserAgent := 'Mozilla/3.0 (compatible; Indy Library)';
      lHTTP.Request.CustomHeaders.AddValue('OrganisationId', dm.Company);
      lHTTP.Request.CustomHeaders.AddValue('Accept', 'application/xml');
      lHTTP.HTTPOptions := [hoForceEncodeParams];
      XmlRS := lHTTP.Get(Url);
      HttpRC := IntToStr(lHTTP.ResponseCode);
      HttpRS := lHTTP.ResponseText;
    except
    end;
    lHTTP.Free;
    if HttpRC = '200' then
      Result := true
    else
      Result := false;
  finally
  end;
end;

 

function PostData(API, xml: string): boolean;
var
  Url: string;
  lHTTP: TIdHTTP;
  XmlData: TStringStream;
  XmlRS, HttpRS, HttpRC: string;
begin
  HttpRC := '';
  HttpRS := '';
  XmlData := TStringStream.Create(xml);
  if Port = '' then
    Url := dm.apiHttp + '://' + Server + '/api' + API
  else
    Url := dm.apiHttp + '://' + Server + ':' + Port + '/api' + API;
  try
    lHTTP := TIdHTTP.Create;
    try
      lHTTP.Request.Clear;
      lHTTP.Request.BasicAuthentication := true;
      lHTTP.Request.Accept := 'application/xml';
      lHTTP.Request.ContentType := 'application/xml';
      lHTTP.Request.UserName := dm.UserName;
      lHTTP.Request.Password := dm.Password;
      lHTTP.Request.ContentEncoding := 'utf-8';
      lHTTP.Request.UserAgent := 'Mozilla/3.0 (compatible; Indy Library)';
      lHTTP.Request.CustomHeaders.AddValue('OrganisationId', dm.Company);
      lHTTP.Request.CustomHeaders.AddValue('Accept', 'application/xml');
      lHTTP.HTTPOptions := [hoForceEncodeParams];
      XmlRS := lHTTP.Post(Url, XmlData);
      HttpRC := IntToStr(lHTTP.ResponseCode);
      HttpRS := lHTTP.ResponseText;
    except
    end;
    XmlData.Free;
    lHTTP.Free;
    if HttpRC = '200' then
      Result := true
    else
      Result := false;
  finally
  end;
end;

 

Thanks for any help in the advance :-)

[Remy Lebeau 1257]

2 hours ago, msd said:

but credentials in the header do not have the same logic

In what way exactly?  Rather than someone translating your TIdHTTP code, can you show your existing TNetHTTPRequest code that is not working for you?

[msd 5]

Hello Remy,

 

I need some code rewritten to use HTTPClient & HTTPRequest instead of IdHTTP.

Just someone need to translate my code (my functions) if he has some minutes free 🙂 

[amit 3]

Just try and let me know if it works.

uses
  ...,  System.NetEncoding, ...
...
var
  Base64: TBase64Encoding;
  httpClient: THttpClient;
  ...
begin
  ...
  httpClient.ContentType:='application/xml';
  Base64 := TBase64Encoding.Create;
  httpClient.CustHeaders.add('Authentication','Basic ' + Base64.Encode('user:password'));
  Base64.Free;
  httpClient.CustHeaders.Add('OrganisationId', 'your dm.Company');
  httpClient.CustHeaders.Add('Accept', 'application/xml');
  httpClient.Post('your URL',xmlData);
  ...
end;

[msd 5]

Hello Amit, 

 

It works fine, thank you for a assistance :-)

[Remy Lebeau 1257]

15 hours ago, amit said:

httpClient.CustHeaders.add('Authentication','Basic ' + Base64.Encode('user:password'));

 

The preferred way to specify authentication credentials in THttpClient is to use its CredentialStorage property, eg:

httpClient.CredentialStorage.AddCredential(TCredential.Create(TAuthTargetType.Server, '', '', 'username', 'password'));

Or its AuthEvent event:

procedure TMyForm.HTTPClientAuthEvent(const Sender: TObject;
  AnAuthTarget: TAuthTargetType; const ARealm, AURL: string;
  var AUserName, APassword: string; var AbortAuth: Boolean;
  var Persistence: TAuthPersistenceType);
begin
  if AnAuthTarget = TAuthTargetType.Server then
  begin
    AUserName := 'username';
    APassword := 'password';
  end;
end;

httpClient.AuthEvent := HTTPClientAuthEvent;

 

See Using an HTTP Client: Handling Authentication and Certificates in Embarcadero's DocWiki.

Edited April 2, 2021 by Remy Lebeau

[amit 3]

Dear Remy,

Are these CredentialStorage and AuthEvent limited to only Basic Authentication?     Is there any processing different among using CustHeaders and the methods you suggested?      And many thanks for your suggestion.

Edited April 3, 2021 by amit

[Remy Lebeau 1257]

1 minute ago, amit said:

Are these CredentialStorage and AuthEvent limited to only Basic Authentication?     

I have no idea.  I don't use T(Net)HttpClient, and don't even have the RTL source code for them to look at.