Simple HTTP server in C

server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <pthread.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>

struct conn
{
    int fd;
} conn;

void *processConn(struct conn *c)
{
    printf("processing connection\n");

    char url[100] = {0};
    char buf[100] = {0};
    int read_s = 0;
    char read_some = 0;
    while ((read_s = read(c->fd, &buf, sizeof(buf))) > 0)
    {
        if (strncmp(buf, "GET ", 5))
        {
            char *start = buf + 5;
            char *end = strchr(start, ' ') + 1;
            strncpy(url, start, end - start);
            printf("got get: %s\n", url);
            break;
        }
    }

    const char *payload_format = "HTTP/1.1 200 OK\n\
Date: Mon, 20 Jun 2022 12:22:35 GMT\n\
Server: Hetelek/1.0.1 (MS)\n\
Last-Modified: Mon, 20 Jun 2022 12:22:35 GMT\n\
Content-Length: %d\n\
Content-Type: text/html\n\n\
%s";
    int payload_max_size = strlen(payload_format) + strlen(url) + 100;
    char payload[payload_max_size];
    memset(payload, 0, payload_max_size);
    sprintf(payload, payload_format, strlen(url), url);
    write(c->fd, payload, strlen(payload));
    close(c->fd);

    free(c);
    return NULL;
}

int main()
{
    struct sockaddr_in sock_addr;
    sock_addr.sin_family = AF_INET;
    sock_addr.sin_port = htons(8080);
    inet_aton("127.0.0.1", &sock_addr.sin_addr.s_addr);

    int tcp_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (tcp_socket == -1)
    {
        printf("socket error\n");
        return 1;
    }
    setsockopt(tcp_socket, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int));

    int bind_ret = bind(tcp_socket, (struct sockaddr *)&sock_addr, sizeof(sock_addr));
    if (bind_ret != 0)
    {
        printf("bind error: %d %s\n", errno, strerror(errno));
        return 1;
    }
    
    printf("listening for connections...\n");
    while (1)
    {
        int listen_fd = listen(tcp_socket, 0);
        if (listen_fd == -1)
        {
            printf("listen error\n");
            return 1;
        }

        struct sockaddr incoming_addr;
        socklen_t addr_len;
        int accept_fd = accept(tcp_socket, &incoming_addr, &addr_len);
        if (accept_fd == -1)
        {
            printf("accept error\n");
            return 1;
        }

        pthread_t thread_id;
        struct conn *z = malloc(sizeof(conn));
        z->fd = accept_fd;
        pthread_create(&thread_id, NULL, processConn, z);
    }
    close(tcp_socket);

    return 0;
}