If i should really give a recommendation to people looking to start a map design project and wondering what renderer to choose for that it would be a big warning if you have any kind of ambition regarding cartographic and visual quality of the results to think hard about choosing any of the client side renderers discussed here.Ĭomparatif de rendu des polygones avec # MaplibreGL # Tangram & # Openlayers qui s’en sort le mieux. Based on my results i would definitely like to see more examples of practical cartography based on the Openlayers vector tiles rendering engine. It would be a bit unrealistic to make an overall recommendation based on a very selective analysis like this. Maplibre GL makes the bottom end with a massive bias expanding polygons beyond their actual shape essentially rendering many of the tests useless and making any kind of precision rendering impossible – while being subject to similar levels of aliasing as Tangram.ĭo i have a recommendation based on these results? Not really. Tangram is on the second place, primarily because of much more noisy results due to aliasing artefacts. Openlayers shows the overall best performance. Please refer to ArcGIS Security and Authentication documentation for additional details.In terms of the quality criteria i looked at here, that is primarily precision, resolution and aliasing artefacts in polygon rendering, the tested client side renderers perform somewhere between so-and-so and badly. The proxy application needs to be secured so that only authorized applications have access. Inspect the request properties to view the path where the application is looking for the proxy. If you see a 404 error in the application this means that the proxy was not found. Look specifically for requests that POST to the proxy. To do this, activate your browser debugging tools then examine the network requests. You can use browser developer tools to determine if the proxy is successfully located. Make sure you have specified the correct location for your proxy in your application code. Once enabled, messages are written to the log that may be useful when troubleshooting the issue. If possible, enable logging for the proxy. You can also set break points in the JavaScript functions of your application, or insert console statements to display values during execution. The execution should halt at the breakpoint, and you should be able to detect where the problem is. If your application environment supports debugging mode, you may be able to set a breakpoint in the proxy page and detect whether it is operating correctly. If not, you may need to troubleshoot the proxy. In other words, all HTTP/HTTPS requests should return with a valid response and no requests should fail. The application should function normally as it did before the proxy page was implemented. Once you have configured the proxy page with the application, test the application to ensure that requests are processed correctly. If all requests in your application use the same proxy, specify the location using the request object's proxyUrl property.ģ - Testing and deploying the application
In order for your application to route requests through the proxy, you must add code to your application defining the location of where the proxy is hosted.
Steps to working with the proxy 1 - Get or build a third-party proxyĪ proxy is installed and runs on its own web server, not on an Esri server or on the computer where ArcGIS Enterprise is installed, (unless your web server also hosts the ArcGIS Enterprise instance). By adding this, the application has a fallback mechanism in place in case the service request fails due to lack of CORS support. This proxy can be referenced within the application via the proxyUrl. If this is not the case, or you are unsure as to whether CORS is supported, a proxy should be configured within the application.
ArcGIS Enterprise services, WMS and WMTS services, etc.), the web server being accessed needs to support CORS. Regardless of the type of data you are accessing (e.g. If CORS is not enabled on a web server a proxy is needed to bypass security on these resources.Īll requests via esriRequest assume CORS support. This was helpful as it was used to bypass the issue many applications had when accessing resources that were not on the same origin. This topic specifically discusses working with proxies, additional information on working with CORS can be found in the CORS guide topic.ĬORS is now the preferred method for accessing cross-domain resources.īefore CORS, it was necessary to work with a proxy page.