C proxy server dropping requests - c

Question

I have a tiny C proxy server which I just want to get one request at a time from the client and send back the response from the server. No pipelining, no anything advanced, just a persistent http connection.
Structs:
typedef struct http_request {
char* h_data; // Header raw data
int h_size; // Header size
char host[5000]; // Host to connect to
char resource[5000]; // Resource to get
} http_request;
typedef struct http_response {
char* h_data; // Header raw data
int h_size; // Header size
char* b_data; // Body raw data
int b_size; // Content-length of the body
} http_response;
Code:
while(1){
// Waiting for user to connect
int sock_user = accept(sock, (struct sockaddr*)NULL, NULL);
int sock_host=-1;
// Accept 1 request at a time and respond
while(1){
http_request req;
http_response resp;
// 1. Client ==> Proxy Server
http_parse_request(sock_user, &req); // uses recv(sock_user)
// 2. Client Proxy ==> Server
if (sock_host < 0)
sock_host=proxy_connect_host(req.host);
write(sock_host, req.h_data, req.h_size);
// 3. Client Proxy <== Server
http_parse_response(sock_host, &resp); // uses send(sock_host)
// 4. Client <== Proxy Server
write(sock_user, resp.h_data, resp.h_size);
write(sock_user, resp.b_data, resp.b_size);
}
}
Now this works good for a few first pages. Then the program blocks at step 1 and the browser just shows Waiting for www.calcoolate.com... all the time.
Firebug:
All of those GET, are requests sent to my proxy. I however receive only the first two of them. I double checked the return value of each write() and recv() and they seem to match exactly with what is expected. I checked for both -1s and 0s.
There must be something wrong with the logic of my proxy.. Any ideas?