[英]How to send rest API (Google Vision's API) request with python?
我想我的问题相对简单又天真,但是我是使用REST API的新手,所以我将不胜感激任何帮助或提示。
我正在尝试使用urllib(或我不需要安装的另一个Python库)发送请求。 根据他们的指南 ,格式为:
POST https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY
JSON请求格式为:
{
"requests":[
{
"image":{
"content":"/9j/7QBEUGhvdG9...image contents...eYxxxzj/Coa6Bax//Z"
},
"features":[
{
"type":"LABEL_DETECTION",
"maxResults":1
}
]
}
]
}
当我尝试在浏览器的URL行中发送以下文本(仅用于测试)时:
https://vision.googleapis.com/v1/images:{
"requests":[
{
"image":{
"content":"/9j/7QBEUGhvdG9eYxxxzj/Coa6Bax//Z"
},
"features":[
{
"type":"LABEL_DETECTION",
"maxResults":1
}
]
}
]
}?key=my_api_key
不幸的是,我收到404错误。
我该怎么办? 我应该使用任何库来生成请求吗? 还是应该将JSON请求放置在URL中的其他位置?
如果您需要使用URL发送Request Body
,则可以使用CURL
。 要测试REST API,有一个著名的软件叫做POSTMAN 。 通过使用此功能,您可以发送请求并接收响应。
卷曲,
curl -v -H "Content-Type: application/json" -X POST \
-d '{"image":{"content":"/9j/7QBEUGhvdG9...image contents...eYxxxzj/Coa6Bax//Z"}, "features":[{"type":"LABEL_DETECTION","maxResults":1}]}' https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY
使用POSTMAN,您可以为其赋予这些值并获得结果。
提供网址,
https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY
选择“ HTTP METHOD”,
POST
然后在raw
字段下添加REQUEST BODY并选择JSON(application/json)
,
{
"requests":[
{
"image":{
"content":"/9j/7QBEUGhvdG9...image contents...eYxxxzj/Coa6Bax//Z"
},
"features":[
{
"type":"LABEL_DETECTION",
"maxResults":1
}
]
}
]
}
这对我有用:
import base64
import requests
import json
URL = "https://vision.googleapis.com/v1/images:annotate?key=YOUR_TOKEN"
#image to base64, which is a long long text
def encode_image(image_path):
with open(image_path, "rb") as image_file:
return base64.b64encode(image_file.read())
#make api call
def image_request(image_path):
data = {
"requests":[
{
"image":{
"content":encode_image(image_path)
},
"features":[
{
"type":"LABEL_DETECTION", #other options: LABEL_DETECTION FACE_DETECTION LOGO_DETECTION CROP_HINTS WEB_DETECTION
"maxResults": 10
}
]
}
]
}
r = requests.post(URL, json = data)
return r.text
#arg = path of image
def main(argv):
api_answer = json.loads(image_request(argv[1]))
try:
rows = api_answer['responses'][0]['labelAnnotations']
except:
print(file_to_proccess)
print(api_answer)
data = []
for item in rows:
data.append([item['mid'], item['description'], item['score'], item['topicality']])
# save somewhere the data list...
if __name__ == "__main__":
main(sys.argv)
经过测试,效果完美
import base64
import requests
import json
url = "https://vision.googleapis.com/v1/images:annotate"
querystring = {"key":".........."}
headers = {
'Content-Type': "application/json",
}
def encode_image(image_path):
with open(image_path, "rb") as image_file:
return base64.b64encode(image_file.read())
def image_request(image_path):
payload = '{ \"requests\":[ { \"image\":{ \"content\":\"'+encode_image(image_path).decode('utf-8')+'" }, \"features\":[ { \"type\":\"TEXT_DETECTION\" } ] } ]}'
response = requests.request("POST", url, data=payload, headers=headers, params=querystring)
return response.text
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