我目前正在使用带有融合表图层的谷歌地图。使用此映射，我进行 AJAX 查询，以填充映射和包含结果的列表。
最近，Google 地图 API 响应返回时出现一个问题，显示为 400"格式错误的请求"错误。在设置筛选器并通过 AJAX 发送过滤器后，使用新结果集填充地图时，偶尔会发生此响应。在查看错误Firefox的调试控制台时，我注意到pb参数可能是问题所在。问题是我不确定这个参数到底是什么格式不正确。
这是出错的 GET 请求：
https://maps.googleapis.com/maps/vt?pb=[...insert_param_code_here...]&callback=_xdc_._n2pwun&token=20077
粘贴了我看到分配给下面 pb 参数的内容。这是进行"无效"查询之一时发送的内容。
"!1m4!1m3!1i13!2i2042!3i3139!1m4!1m3!1i13!2i2043!3i3139!1m4!1m3!1i13!2i2042!3i3140!1m4!1m3!1i13!2i2042!3i3141!1m4!1m3!1i13!2i2043!3i3140!1m4!1m3!1i13!2i2043!3i3141!1m4!1m3!1i13!2i2042!3i3142!1m4!1m3!1i13!2i2042!3i3143!1m4!1m3!1i13!2i2043!3i3142!1m4!1m3!1i13!2i2043!3i3143!1m4!1m3!1i13!2i2044!3i3139!1m4!1m3!1i13!2i2045!3i3139!1m4!1m3!1i13!2i2046!3i3139!1m4!1m3!1i13!2i2044!3i3140!1m4!1m3!1i13!2i2044!3i3141!1m4!1m3!1i13!2i2045!3i3140!1m4!1m3!1i13!2i2045!3i3141!1m4!1m3!1i13!2i2044!3i3142!1m4!1m3!1i13!2i2044!3i3143!1m4!1m3!1i13!2i2045!3i3142!1m4!1m3!1i13!2i2045!3i3143!1m4!1m3!1i13!2i2046!3i3140!1m4!1m3!1i13!2i2046!3i3141!1m4!1m3!1i13!2i2046!3i3142!1m4!1m3!1i13!2i2046!3i3143!2m21!1e2!2sft:tableID!4m2!1ssg!2s%20Cities_With_Charters%20%3D%20'East%20St.%20Louis%20Area'%20AND%20Students_Served%20LIKE%20'%25'%20AND%20School_Type_Dropdown%20IN%20('Charter')%20ORDER%20BY%20School_Name%20ASC!4m2!1ssc!2sSchool_Info_ID%2C%20CPS_ID%2C%20RCDTS%2C%20School_Name%2C%20Street_Address%2C%20City%2C%20State%2C%20Zip%2C%20Phone%2C%20Website%2C%20Lat%2C%20Long%2C%20Year_Opened%2C%20School_Description%2C%20District_Info_ID%2C%20District_Name%2C%20Charter_Renew_YR%2C%20Network_ID%2C%20Network%2C%20Community_Area%2C%20State_Rep_District%2C%20State_Sen_District%2C%20Ward_Remapped%2C%20Grades_Served%2C%20Grades_Capacity%2C%20Serves_ES%2C%20Serves_HS%2C%20Serves_MS%2C%20Serves_Dropouts%2C%20School_Type_Dropdown%2C%20School_Type_Color%2C%20School_Type_Display%2C%20Profile_Type%2C%20SQRP_Rating%2C%20SQRP_Profile%2C%20Cities_With_Charters%2C%20Link_IIRC%2C%20Students_Served!4m2!1ssq!2s'School_Type_Color'%20%3D%20'GREEN'$'School_Type_Color'%20%3D%20'ORANGE'$'School_Type_Color'%20%3D%20'BLUE'$'School_Type_Color'%20%3D%20'MAGENTA'!4m2!1sc!2si:grn_blank$i:orange_blank$i:ltblu_blank$i:purple_blank!4m2!1sy!2s2!4m2!1stmplt!2s2!5i1!3m3!2sen-US!3sUS!5e18!4e3!12m1!5b1"
以下是没有 URL 编码的查询，仅供参考：
SELECT School_Info_ID, CPS_ID, RCDTS, School_Name, Street_Address, City, State, Zip, Phone, Website, Lat, Long, Year_Opened, School_Description, District_Info_ID, District_Name, Charter_Renew_YR, Network_ID, Network, Community_Area, State_Rep_District, State_Sen_District, Ward_Remapped, Grades_Served, Grades_Capacity, Serves_ES, Serves_HS, Serves_MS, Serves_Dropouts, School_Type_Dropdown, School_Type_Color, School_Type_Display, Profile_Type, SQRP_Rating, SQRP_Profile, Cities_With_Charters, Link_IIRC, Students_Served FROM tableID WHERE Cities_With_Charters = 'East St. Louis Area' AND Students_Served LIKE '%' AND School_Type_Dropdown IN ('Charter') ORDER BY School_Name ASC
到目前为止，我为解决此问题而采取的步骤：
- 确保发送到融合表的任何查询字符串都已使用 URL 编码发送。
- 确保检查我的引号和引号，并确保发送的查询中没有任何杂散的引号。
- 检查了我的谷歌地图初始化参数，以确保我没有打错字或添加任何不存在的参数。
在确保不发送格式错误的内容方面，我是否缺少任何其他预防措施？
我通过打开Chrome开发人员工具并转到：应用程序>清除存储>清除站点数据来解决此问题。然后，在开发人员工具仍处于打开状态的情况下，单击并按住浏览器左上角的刷新按钮，直到看到"清空缓存和硬重新加载"字样。点击它，你就可以开始了。
我遇到了同样的问题。当页面上包含融合表图层的地图结果的 CSS 与地图参数不一致时，会导致此问题。我修复了CSS，地图开始出现。