C socket recieves data then does not send it - c

Question

i have created a simple socket connection which sends a request to a node.js app and receives some random data and then sends back the data but it sends and receives the data correctly but does not send back the random data
char *httpbody;
struct addrinfo hints, *result;
const char *host = "localhost";
char user[512] = "test#gmail.com";
char pass[512] = "test";
char headers[512];
srand(time(NULL));
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(host, "3000", &hints, &result) != 0) {
freeaddrinfo(result);
perror("Could not resolve hostname.");
exit(1);
}
int newsocket = socket(result->ai_family, result->ai_socktype, 0);
if (newsocket == -1) {
perror("Could not create socket.");
freeaddrinfo(result);
close(newsocket);
exit(1);
}
if (connect(newsocket, result->ai_addr, result->ai_addrlen) == -1) {
perror("Could not connect.");
freeaddrinfo(result);
close(newsocket);
exit(1);
}
sprintf(headers, "GET /auth?user=%s&pass=%s HTTP/1.1\r\n"
"User-Agent: Device\r\n"
"Accept-Language: de,en;q=0.7,en-us;q=0.3\r\n"
"Content-Type: text/html; charset=UTF-8\r\n"
"Connection: Close\r\n\r\n", user, pass);
if ((send(newsocket, headers, strlen(headers), 0)) == -1) {
perror("Could not send data.");
freeaddrinfo(result);
close(newsocket);
exit(1);
}
char response[51201] = "";
recv(newsocket, response, 51200, 0);
response[strlen(response)] = '\0';
httpbody = strstr(response, "\r\n\r\n");
if (httpbody) {
httpbody += 8;
}
int data = rand() % 255 + 1;
sprintf(headers, "GET /add_data?user=%s&data=%i&"
"uid=%s HTTP/1.1\r\n"
"User-Agent: Device\r\n"
"Accept-Language: de,en;q=0.7,en-us;q=0.3\r\n"
"Content-Type: text/html; charset=UTF-8\r\n"
"Connection: Close\r\n\r\n", user, data, httpbody);
if ((send(newsocket, headers, strlen(headers), 0)) == -1) {
perror("Could not send data.");
freeaddrinfo(result);
close(newsocket);
exit(1);
}
printf("done");
freeaddrinfo(result);
close(newsocket);
when i remove the revc request it works fine and it does not show any errors and i am completely lost

Answer 1

Check this lines of code:
recv(newsocket, response, 51200, 0);
response[strlen(response)] = '\0';`
recv doesn't return null-terminated data, so you cannot use strlen for determine size of data.
You must use return value of recv instead:
int data_size = recv(newsocket, response, 51200, 0);

Answer 2

An HTTP connection ends each time when you specify "Connection: close" in HTTP 1.1, thus the socket is not valid after you finish reading the response from the server.
Possible solutions are:
Remove "Connection: close" header from the first request
Connect() to the server again after you recv() the response