static void process_client(int fd)
...
    static char env[8192];  /* static variables are not on the stack */
    static size_t env_len;
    char reqpath[2048]; // $ebp-2064
    const char *errmsg; // $ebp-16
    int i; // $ebp-12
           // $ebp-8 and $ebp -4 is callee-saved reg (%EDI, %ESI)

const char *http_request_headers(int fd)
...
    // i: $ebp-12
    // sp: $ebp-16
    // colon: $ebp-20
    // value: $ebp-532
    static char buf[8192];      /* static variables are not on the stack */
    int i;
    char value[512];
    char envvar[512];