arcgis 3.14 add authorization header and preserve query parameters via setRequestPreCallback

DanielJennings — Thu, 28 Aug 2025 20:26:49 GMT

Greetings!!

I have been tasked with adding an Authorization header to our layer query request.

Referencing Solved: Re: How to set headers for esriRequest using .setR... - Esri Community I managed to get the setRequestPreCallback set and the Authorization header added.

However, when the callback function is fired, it only has 4 of the 9 needed query parameters for the link to work.

Is there a method of recovering the missing query parameters??

We are using arcgis 3.14.

Thank you,

-Daniel

Re: arcgis 3.14 add authorization header and preserve query parameters via setRequestPreCallback

VenkataKondepati — Fri, 29 Aug 2025 13:08:10 GMT

In 3.14 you can’t. esri.config.defaults.io.setRequestPreCallback fires before ArcGIS JS finalizes the request, so you’ll only see a partial content object; the library appends the rest (e.g., f, where/outFields, token, cache-buster, JSONP bits) after your callback. There’s no API to “recover” those missing params in that hook.

Practical options:

Use a proxy to add the Authorization header server-side. This is the most reliable with 3.x (no CORS/header headaches, no param timing issues).
Bypass QueryTask/FeatureLayer and call the endpoint yourself with esri.request, where you supply the full payload and header:

require(["esri/request"], function(esriRequest){ esriRequest({ url: layerUrl + "/query", content: { where: "GlobalID='" + guid + "'", outFields: "*", returnGeometry: false, f: "json" }, headers: { "Authorization": "Bearer " + token } }, { usePost: true }).then(handle, err); });

Upgrade (if you can) to a later 3.x or 4.x, where header handling and CORS behavior are cleaner. Still, for 3.x the proxy remains the simplest fix.

Keep using the pre-callback only to inject the header; don’t rely on it to inspect the final query. If you need to see/shape every param, build the request yourself or proxy it.

topic arcgis 3.14 add authorization header and preserve query parameters via setRequestPreCallback in ArcGIS JavaScript Maps SDK Questions

arcgis 3.14 add authorization header and preserve query parameters via setRequestPreCallback

Re: arcgis 3.14 add authorization header and preserve query parameters via setRequestPreCallback