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Difference "Templates: Top Level Blocks (v 1.x)" ver. 3 versus ver. 4

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## Related
- [Templats](/wikipp/en/page/cppcms_1x_templates)
- [Templates](/wikipp/en/page/cppcms_1x_templates)
- [General Concepts](/wikipp/en/page/cppcms_1x_templates_gen)
- [Top Level Blocks](/wikipp/en/page/cppcms_1x_templates_block)
- [Rendering Commands](/wikipp/en/page/cppcms_1x_templates_comm)
- [Flow Control](/wikipp/en/page/cppcms_1x_templates_flow)
## Tutorials
<!-- - [Start With Templates](/wikipp/en/page/tut_hw_templates)
- [Start With Forms](/wikipp/en/page/tut_forms) -->
<h1>include <iostream></h1> <h1>include <string></h1> <h1>include <cstring></h1>

include <sys/socket.h>

include <netinet/in.h>

include <unistd.h>

int main() { int server_fd, client_fd; struct sockaddr_in address; int addrlen = sizeof(address);

// HTML content to be served
std::string html = 
    "HTTP/1.1 200 OK\r\n"
    "Content-Type: text/html\r\n\r\n"
    "<!DOCTYPE html>"
    "<html>"
    "<head><title>My C++ Web</title></head>"
    "<body><h1>Welcome to a Simple Web Page!</h1><p>This is served from C++.</p></body>"
    "</html>";

// Create socket
server_fd = socket(AF_INET, SOCK_STREAM, 0);
if (server_fd == 0) {
    perror("socket failed");
    exit(EXIT_FAILURE);
}

// Bind
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(8080);

if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
    perror("bind failed");
    exit(EXIT_FAILURE);
}

// Listen
if (listen(server_fd, 3) < 0) {
    perror("listen");
    exit(EXIT_FAILURE);
}

std::cout << "Server is running on http://localhost:8080" << std::endl;

while (true) {
    // Accept client
    client_fd = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen);
    if (client_fd < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }

    char buffer[3000] = {0};
    read(client_fd, buffer, 3000);  // Read client request

    std::cout << "Request:\n" << buffer << std::endl;

    // Send response
    send(client_fd, html.c_str(), html.size(), 0);
    close(client_fd); // Close connection
}

return 0;

}

<h1>include <iostream></h1> <h1>include <string></h1> <h1>include <cstring></h1>

include <sys/socket.h>

include <netinet/in.h>

include <unistd.h>

int main() { int server_fd, client_fd; struct sockaddr_in address; int addrlen = sizeof(address);

// HTML content to be served
std::string html = 
    "HTTP/1.1 200 OK\r\n"
    "Content-Type: text/html\r\n\r\n"
    "<!DOCTYPE html>"
    "<html>"
    "<head><title>My C++ Web</title></head>"
    "<body><h1>Welcome to a Simple Web Page!</h1><p>This is served from C++.</p></body>"
    "</html>";

// Create socket
server_fd = socket(AF_INET, SOCK_STREAM, 0);
if (server_fd == 0) {
    perror("socket failed");
    exit(EXIT_FAILURE);
}

// Bind
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(8080);

if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
    perror("bind failed");
    exit(EXIT_FAILURE);
}

// Listen
if (listen(server_fd, 3) < 0) {
    perror("listen");
    exit(EXIT_FAILURE);
}

std::cout << "Server is running on http://localhost:8080" << std::endl;

while (true) {
    // Accept client
    client_fd = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen);
    if (client_fd < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }

    char buffer[3000] = {0};
    read(client_fd, buffer, 3000);  // Read client request

    std::cout << "Request:\n" << buffer << std::endl;

    // Send response
    send(client_fd, html.c_str(), html.size(), 0);
    close(client_fd); // Close connection
}

return 0;

}

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