谷歌與ENC路徑靜態映射並不總是工作

我有實現靜態地圖，顯示基於谷歌與ENC路徑靜態映射並不總是工作

routes[0]->overview_polyline

的路線，我也有增加的開始和結束標記

的問題是，並不總是工作，我認爲有一個與overview_polyline一個問題，但我無法弄清楚

這是一個工作的靜態地圖，顯示兩個市場和航線

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這條路線是行不通的

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