要使用AWS REST请求，您可以使用各种编程语言和框架来发送HTTP请求。以下是一个使用Python的示例代码：

import requests
import datetime
import hashlib
import hmac

# AWS访问密钥
access_key = 'your_access_key'
secret_key = 'your_secret_key'

# AWS区域和服务
region = 'us-west-2'
service = 's3'

# 请求信息
method = 'GET'
host = 's3.amazonaws.com'
path = '/example-bucket/example-object'
headers = {
    'Host': host,
    'X-Amz-Content-Sha256': 'UNSIGNED-PAYLOAD',
    'X-Amz-Date': datetime.datetime.utcnow().strftime('%Y%m%dT%H%M%SZ'),
}

# 生成规范请求字符串
canonical_request = method + '\n' + path + '\n\n' + 'host:' + host + '\n\nhost\nUNSIGNED-PAYLOAD'

# 生成签名密钥
date_stamp = headers['X-Amz-Date'][0:8]
credential_scope = date_stamp + '/' + region + '/' + service + '/' + 'aws4_request'
string_to_sign = headers['X-Amz-Date'] + '\n' + credential_scope

signing_key = hmac.new(('AWS4' + secret_key).encode('utf-8'), date_stamp.encode('utf-8'), hashlib.sha256).digest()
signing_key = hmac.new(signing_key, region.encode('utf-8'), hashlib.sha256).digest()
signing_key = hmac.new(signing_key, service.encode('utf-8'), hashlib.sha256).digest()
signing_key = hmac.new(signing_key, 'aws4_request'.encode('utf-8'), hashlib.sha256).digest()

# 生成签名
signature = hmac.new(signing_key, string_to_sign.encode('utf-8'), hashlib.sha256).hexdigest()

# 添加签名到请求头
headers['Authorization'] = 'AWS4-HMAC-SHA256 Credential=' + access_key + '/' + credential_scope + ', SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=' + signature

# 发送请求
url = 'https://' + host + path
response = requests.get(url, headers=headers)

print(response.text)

此示例演示了如何使用Python中的requests库发送带有AWS签名的GET请求。您需要将代码中的access_key和secret_key替换为您自己的AWS访问密钥，并根据您的要求修改region，service，host和path。

请注意，此示例仅适用于简单的GET请求，并且假定您具有适当的AWS权限来执行此请求。如果您需要执行其他类型的请求，例如POST或PUT，请根据需要修改代码。