HERE Routing API：如何在路径请求中规避多个多边形禁行区域？

我看到过一篇文章提到路径请求最多可添加20个多边形禁行区域，单个多边形的请求能正常返回结果：

GET https://router.hereapi.com/v8/routes?origin=33.751305,-118.188812&destination=34.092232,-117.435051&transportMode=car&avoid[areas]=polygon:34.073334,-118.027496;33.888504,-117.813255;33.895847,-118.220070&apiKey={YOUR API KEY}

但我不知道怎么发起包含多个多边形的请求，试了几种方法都失败了：

• 用分号分隔两个多边形，触发请求格式错误：

  GET https://router.hereapi.com/v8/routes?origin=33.751305,-118.188812&destination=34.092232,-117.435051&transportMode=car&avoid[areas]=polygon:34.073334,-118.027496;33.888504,-117.813255;33.895847,-118.220070;polygon:54.073334,-118.027496;53.888504,-117.813255;53.895847,-118.220070&apiKey={YOUR API KEY}
  

• 用感叹号分隔两个多边形，触发请求格式错误：

  GET https://router.hereapi.com/v8/routes?origin=33.751305,-118.188812&destination=34.092232,-117.435051&transportMode=car&avoid[areas]=polygon:34.073334,-118.027496;33.888504,-117.813255;33.895847,-118.220070!polygon:54.073334,-118.027496;53.888504,-117.813255;53.895847,-118.220070&apiKey={YOUR API KEY}
  

• 添加多个avoid[areas]参数，响应提示不支持多个该参数：

  GET https://router.hereapi.com/v8/routes?origin=33.751305,-118.188812&destination=34.092232,-117.435051&transportMode=car&avoid[areas]=polygon:34.073334,-118.027496;33.888504,-117.813255;33.895847,-118.220070&avoid[areas]=polygon:54.073334,-118.027496;53.888504,-117.813255;53.895847,-118.220070&apiKey={YOUR API KEY}
  

解决方案 #

在同一个avoid[areas]参数中，用**竖线|**分隔多个多边形即可，每个多边形保持polygon:开头、顶点用分号分隔的格式。示例请求如下：

GET https://router.hereapi.com/v8/routes?origin=33.751305,-118.188812&destination=34.092232,-117.435051&transportMode=car&avoid[areas]=polygon:34.073334,-118.027496;33.888504,-117.813255;33.895847,-118.220070|polygon:54.073334,-118.027496;53.888504,-117.813255;53.895847,-118.220070&apiKey={YOUR API KEY}

注意事项

• 多边形顶点需按顺序定义（顺时针/逆时针均可），保证多边形闭合
• 最多支持20个多边形，超出会返回参数错误
• 若顶点数量较多，建议对URL做URL编码，避免特殊字符导致请求异常

内容的提问来源于stack exchange，提问作者Addict of Rice