lazarus开发应用提供http接口，简单试用了一下fphttpapp，发现非常易用，直接支持中文内容
引用3个核心单元
fphttpapp, httpdefs, httproute启用端口定义路由
procedure route1(aReq: TRequest; aResp: TResponse);
begin
aResp.Content:='<html><head><title>欢迎测试</title></head><body><h1>Route 1 The Default</h1>欢迎测试</body></html>';
end;
procedure route2(aReq: TRequest; aResp: TResponse);
begin
aResp.Content:='<html><body><h1>lazarus提供http接口</h1></body></html>';
end;
procedure TForm1.StaticText1Click(Sender: TObject);
begin
HTTPRouter.RegisterRoute('', @route1);
HTTPRouter.RegisterRoute('/', @route1);
HTTPRouter.RegisterRoute('/2', @route2);
fphttpapp.Application.Port := 8088;
fphttpapp.Application.Threaded := true;
fphttpapp.Application.Initialize;
//fphttpapp.Application.Run;
// Run the server in a thread.
TWebServerThread.Create(false); // false means the server thread runs immediately
end;如果是无界面应用可以直接启动，这里是有界面应用，所以再写一个线程启动监听更加好用
下面是定以线程和线程启动http服务
type
TWebServerThread = class(TThread)
protected
procedure Execute; override;
public
constructor Create(CreateSuspended: boolean);
end;
{ TForm1 }
......
implementation
{$R *.lfm}
constructor TWebServerThread.Create(CreateSuspended: boolean);
begin
inherited Create(CreateSuspended);
FreeOnTerminate := true;
end;
procedure TWebServerThread.Execute;
begin
writeln(' fphttpapp.Application.Run');
fphttpapp.Application.Run;
end;