destroy_req()

destroy_req() is using when the Req object has been deep copied. It is necessary to free the memory of the deep copy of Req object, especially for the async operations.

typedef struct
{
    Res *res;
} ctx_t;

void handler(Req *req, Res *res)
{
    ctx_t *ctx = malloc(sizeof(*ctx));
    ctx->req = copy_req(req);
    destroy_req(ctx->req);
}