单位内部有个 ArcGIS 的服务器，现在需要加载上面的地理要素图层，已经确认 ArcGIS 服务器是允许跨域的，之前使用 Jq 或原生 JS 写没有跨域问题，vue 使用 ArcGIS API for JS 4.19
直接访问提示跨域问题，代码和报错如下
let AHDX_ZH0717 = new TileLayer({ title: "AHDX_ZH0717", url: "http://10.34.x.x:6080/arcgis/rest/services/AHDX_ZH0717/MapServer", }); map.add(AHDX_ZH0717); // 提示跨域信息 Access to image at 'http://10.34.x.x:6080/arcgis/rest/services/AHDX_ZH0717/MapServer/tile/7/52/105?blankTile=false' from origin 'http://127.0.0.1:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. 然后想到了使用 nginx 反向代理，nginx 配置文件如下
location /gisserver { add_header Access-Control-Allow-Origin '*'; add_header Access-Control-Allow-Headers X-Requested-With; add_header Access-Control-Allow-Methods GET,POST,OPTIONS; proxy_pass http://10.34.x.x:6080/arcgis/; proxy_read_timeout 600s; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; # ArcGIS Server 要求必须添加 X-Forwarded-Host 反代标头 proxy_set_header X-Forwarded-Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; } 此时 vue 项目的代码改为(nginx 在本地 9090 端口)
let AHDX_ZH0717 = new TileLayer({ title: "AHDX_ZH0717", url: "http://127.0.0.1:9090/gisserver/rest/services/AHDX_ZH0717/MapServer", }); map.add(AHDX_ZH0717); // 提示跨域配置重复 Access to fetch at 'http://127.0.0.1:9090/gisserver/rest/services/AHDX_ZH0717/MapServer?f=json' from origin 'http://127.0.0.1:8080' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values 'http://127.0.0.1:8080, *', but only one is allowed. Have the server send the header with a valid value, or, if an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. / 如果注释掉 nginx 配置文件的跨域设置则提示 Access to image at 'http://127.0.0.1:9090/gisserver/rest/services/AHDX_ZH0717/MapServer/tile/7/52/106?blankTile=false' from origin 'http://127.0.0.1:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. 现在头都大了，有没有好兄弟知道咋解决
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