libmemcached-1.0.18 using append returns error

[zhanglistar]

os: ubuntu 16.04
golang : go version go1.10 linux/amd64
gobeansdb : commit 33b7ec9
libmemcached: 1.0.18
gcc:gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.10)

Code:
`#include <libmemcached/memcached.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char **argv) {
//memcached_servers_parse (char *server_strings);
memcached_server_st *servers = NULL;
memcached_st *memc;
memcached_return rc;
char *key = "keystring";
char *value = "keyvalue";

char *retrieved_value;
size_t value_length;
uint32_t flags;

memc = memcached_create(NULL);
servers = memcached_server_list_append(servers, "103.211.228.3", 7900, &rc);
rc = memcached_server_push(memc, servers);

if (rc == MEMCACHED_SUCCESS)
fprintf(stderr, "Added server successfully\n");
else
fprintf(stderr, "Couldn't add server: %s\n", memcached_strerror(memc, rc));

char* newkey = "keystring ab";
rc = memcached_set(memc, key, strlen(key), value, strlen(value), (time_t)0, (uint32_t)0);
if (rc == MEMCACHED_SUCCESS)
fprintf(stderr, "Key stored successfully\n");
else
fprintf(stderr, "Couldn't store key: %s\n", memcached_strerror(memc, rc));

rc = memcached_append(memc, key, strlen(key), newkey, strlen(newkey), (time_t)0, (uint32_t)0);

if (rc == MEMCACHED_SUCCESS)
fprintf(stderr, "Key stored successfully\n");
else
fprintf(stderr, "Couldn't store key: %s\n", memcached_strerror(memc, rc));

retrieved_value = memcached_get(memc, key, strlen(key), &value_length, &flags, &rc);
printf("Yay!\n");

if (rc == MEMCACHED_SUCCESS) {
fprintf(stderr, "Key retrieved successfully\n");
printf("The key '%s' returned value '%s'.\n", key, retrieved_value);
free(retrieved_value);
}
else
fprintf(stderr, "Couldn't retrieve key: %s\n", memcached_strerror(memc, rc));

return 0;
}
`

Error message:
➜ tests ./a.out
Added server successfully
Key stored successfully
Couldn't store key: SERVER ERROR
Yay!
Key retrieved successfully
The key 'keystring' returned value 'keyvalue'.

[Yijun Zhao]

We just test with libmc, please try using this instead.