有时 Google 地理编码 API returns 500 服务器错误

Question

有时 Google 地图 API returns 500 server error 根据德国邮政编码回复，我不明白为什么。

我希望它足够具体。有什么想法吗？

https://maps.googleapis.com/maps/api/geocode/json?key={api_key}&address={postal_code}&language=de&region=de&components=country:DE&sensor=false

Answer 1

由于您指定问题不是给定地址而是看似 "random" 的行为，这可能属于其他 "famous" API 的 documented 行为。

至于其他情况，推荐的策略是Exponential backoff for the Geocoding API，基本上就是延迟一定时间后重试。

如果上面的 link 下降或改变，我引用这篇文章：

Exponential Backoff

In rare cases something may go wrong serving your request; you may receive a 4XX or 5XX HTTP response code, or the TCP connection may simply fail somewhere between your client and Google's server. Often it is worthwhile re-trying the request as the followup request may succeed when the original failed. However, it is important not to simply loop repeatedly making requests to Google's servers. This looping behavior can overload the network between your client and Google causing problems for many parties.

A better approach is to retry with increasing delays between attempts. Usually the delay is increased by a multiplicative factor with each attempt, an approach known as Exponential Backoff.

For example, consider an application that wishes to make this request to the Google Maps Time Zone API:

https://maps.googleapis.com/maps/api/timezone/json?location=39.6034810,-119.6822510&timestamp=1331161200&key=YOUR_API_KEY

The following Python example shows how to make the request with exponential backoff:

import json
import time
import urllib
import urllib2

def timezone(lat, lng, timestamp):
    # The maps_key defined below isn't a valid Google Maps API key.
    # You need to get your own API key.
    # See https://developers.google.com/maps/documentation/timezone/get-api-key
    maps_key = 'YOUR_KEY_HERE'
    timezone_base_url = 'https://maps.googleapis.com/maps/api/timezone/json'

    # This joins the parts of the URL together into one string.
    url = timezone_base_url + '?' + urllib.urlencode({
        'location': "%s,%s" % (lat, lng),
        'timestamp': timestamp,
        'key': maps_key,
    })

    current_delay = 0.1  # Set the initial retry delay to 100ms.
    max_delay = 3600  # Set the maximum retry delay to 1 hour.

    while True:
        try:
            # Get the API response.
            response = str(urllib2.urlopen(url).read())
        except IOError:
            pass  # Fall through to the retry loop.
        else:
            # If we didn't get an IOError then parse the result.
            result = json.loads(response.replace('\n', ''))
            if result['status'] == 'OK':
                return result['timeZoneId']
            elif result['status'] != 'UNKNOWN_ERROR':
                # Many API errors cannot be fixed by a retry, e.g. INVALID_REQUEST or
                # ZERO_RESULTS. There is no point retrying these requests.
                raise Exception(result['error_message'])

        if current_delay > max_delay:
            raise Exception('Too many retry attempts.')
        print 'Waiting', current_delay, 'seconds before retrying.'
        time.sleep(current_delay)
        current_delay *= 2  # Increase the delay each time we retry.

tz = timezone(39.6034810, -119.6822510, 1331161200)
print 'Timezone:', tz

当然这不会解决你提到的"false responses"；我怀疑这取决于数据质量并且不会随机发生。

有时 Google 地理编码 API returns 500 服务器错误

Sometimes the Google Geocoding API returns a 500 server error

api

google-maps

server-error