How to receive and parse requests as an HTTP server?

Question

For a class I have to implement an HTTP web server in C++. I currently have the server to the point that it can listen and accept connections, but I can't figure out how to accept data and parse it. When I send a request I get an error saying "Transport endpoint is nt connected." Here's what my code looks like so far:

int main(int argc, char *argv[]) {

    // parse CLI args
    if (argc != 3) { /** change to 3 once DOCROOT is added */
        cout << "invalid arguments" << endl;
        exit(1);
    }
    const char *DOCROOT = argv[1];
    const char *PORT = argv[2];

    // declare vars....from beej's so some not in use yet
    int sockfd, new_fd;
    struct addrinfo hints, *servinfo, *p;
    struct sockaddr_storage their_addr;
    socklen_t sin_size;
    struct sigaction sa;
    int yes = 1;
    char s[INET6_ADDRSTRLEN];
    int rv;

    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = AI_PASSIVE;

    // try getaddrinfo
    if ((rv = getaddrinfo(nullptr, PORT, &hints, &servinfo)) != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
        return 1;
    }

    // loop through getaddrinfo response and bind when possible
    for (p=servinfo; p!=nullptr; p=p->ai_next) {
        if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) {
            perror("server: socket");
            continue;
        }

        if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
            perror("setsockopt");
            exit(1);
        }

        if (::bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
            close(sockfd);
            perror("server: bind");
            continue;
        }

        break;
    }

    freeaddrinfo(servinfo);

    if (p == nullptr) {
        fprintf(stderr, "server: failed to bind\n");
        exit(1);
    }

    /** choose backlog number and declare constant */
    if (listen(sockfd, 5) == -1) {
        perror("listen");
        exit(1);
    }

    sa.sa_handler = sigchld_handler; // reap all dead processes
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = SA_RESTART;
    if (sigaction(SIGCHLD, &sa, nullptr) == -1) {
        perror("sigaction");
        exit(1);
    }

    printf("server: waiting for connections on port %s...\n", PORT);


    while(true) { /** this will be the main accept loop */
        sin_size = sizeof their_addr;
        new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
        if (new_fd == -1) {
            perror("accept");
            continue;
        }

        inet_ntop(their_addr.ss_family,
                  get_in_addr((struct sockaddr *)&their_addr),
                  s, sizeof s);
        printf("server: got connection from %s\n", s);

        // receive
        char recvbuf[1024];
        int recvbuflen = 1024;
        int request = recv(sockfd, recvbuf, recvbuflen, 0);

        if (request == -1) perror("error receiving data");

        if(send(new_fd, "Data received", 15, 0) == -1)
            perror("send");
        close(new_fd);
        exit(0);

    }

    return 0;

}