diff --git a/src/api/file-proxy.api.js b/src/api/file-proxy.api.js
index a14104e89..1e73b53a6 100644
--- a/src/api/file-proxy.api.js
+++ b/src/api/file-proxy.api.js
@@ -1,4 +1,3 @@
-import axios from 'axios'
 import { isString } from 'lodash'
 
 import { getServiceProxyBaseUrl } from '@/config/baseUrl.config'
@@ -57,40 +56,3 @@ export function proxifyUrl(url) {
     }
     return `${getServiceProxyBaseUrl()}${fileAsPath}`
 }
-
-/**
- * Get a file through our service-proxy backend, taking care of CORS headers in the process.
- *
- * That means that a file for which there is no defined CORS header will still be accessible through
- * this function (i.e. Dropbox/name your cloud share links)
- *
- * @param {String} fileUrl
- * @param {Object} [options]
- * @param {Number} [options.timeout] How long should the call wait before timing out
- * @returns {Promise<AxiosResponse>} A promise which resolve to the proxy response
- */
-export default function getFileThroughProxy(fileUrl, options = {}) {
-    const { timeout = null } = options
-    return new Promise((resolve, reject) => {
-        try {
-            axios({
-                method: 'get',
-                url: proxifyUrl(fileUrl),
-                timeout,
-            })
-                .then((response) => {
-                    resolve(response)
-                })
-                .catch((error) => {
-                    log.error(
-                        'Error while accessing file URL through service-proxy',
-                        fileUrl,
-                        error
-                    )
-                    reject(error)
-                })
-        } catch (error) {
-            reject(error)
-        }
-    })
-}
diff --git a/src/api/files.api.js b/src/api/files.api.js
index f63f0c2ea..12629adc5 100644
--- a/src/api/files.api.js
+++ b/src/api/files.api.js
@@ -1,10 +1,11 @@
-import axios, { AxiosError } from 'axios'
+import axios from 'axios'
 import FormData from 'form-data'
 import pako from 'pako'
 
-import getFileThroughProxy from '@/api/file-proxy.api'
+import { proxifyUrl } from '@/api/file-proxy.api'
 import { getServiceKmlBaseUrl } from '@/config/baseUrl.config'
 import log from '@/utils/logging'
+import { isInternalUrl } from '@/utils/utils'
 
 /**
  * KML links
@@ -312,8 +313,7 @@ export function loadKmlData(kmlLayer) {
                 new Error(`No file URL defined in this KML layer, cannot load data ${kmlLayer.id}`)
             )
         }
-        axios
-            .get(kmlLayer.kmlFileUrl)
+        getFileFromUrl(kmlLayer.kmlFileUrl)
             .then((response) => {
                 if (response.status === 200 && response.data) {
                     resolve(response.data)
@@ -324,19 +324,54 @@ export function loadKmlData(kmlLayer) {
                 }
             })
             .catch((error) => {
-                if (error instanceof AxiosError) {
-                    getFileThroughProxy(kmlLayer.kmlFileUrl)
-                        .then((response) => {
-                            resolve(response.data)
-                        })
-                        .catch((error) => {
-                            reject(error)
-                        })
-                } else {
-                    const msg = `Failed to load KML data: ${error}`
-                    log.error(msg)
-                    reject(new Error(msg))
-                }
+                const msg = `Failed to load KML data: ${error}`
+                log.error(msg)
+                reject(new Error(msg))
             })
     })
 }
+
+/**
+ * Generic function to load a file from a given URL.
+ *
+ * When the URL is not an internal url and it doesn't support CORS or use HTTP it is sent over a
+ * proxy.
+ *
+ * @param {string} url URL to fetch
+ * @param {Number} [options.timeout] How long should the call wait before timing out
+ * @returns {Promise<AxiosResponse<any, any>>}
+ */
+export async function getFileFromUrl(url, options = {}) {
+    const { timeout = null } = options
+    if (/^https?:\/\/localhost/.test(url) || isInternalUrl(url)) {
+        // don't go through proxy if it is on localhost or the internal server
+        return axios.get(url, { timeout })
+    } else if (url.startsWith('http://')) {
+        // HTTP request goes through the proxy
+        return axios.get(proxifyUrl(url), { timeout })
+    }
+
+    // For other urls we need to check if they support CORS
+    let supportCORS = false
+    try {
+        // unfortunately we cannot do a real preflight call using options because browser don't
+        // allow to set the Access-Control-* headers ! Also there is no way to find out if a request
+        // is failing due to network reason or due to CORS issue,
+        // see https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors
+        // Therefore here we try to get the resource using head instead
+        await axios.head(url, { timeout })
+        supportCORS = true
+    } catch (error) {
+        log.error(
+            `URL ${url} failed with ${error}. It might be due to CORS issue, ` +
+                `therefore the request will be fallback to the service-proxy`
+        )
+    }
+
+    if (supportCORS) {
+        // Server support CORS
+        return axios.get(url, { timeout })
+    }
+    // server don't support CORS use proxy
+    return axios.get(proxifyUrl(url), { timeout })
+}
diff --git a/src/config/baseUrl.config.js b/src/config/baseUrl.config.js
index 0c9d0b79d..4f1e105a8 100644
--- a/src/config/baseUrl.config.js
+++ b/src/config/baseUrl.config.js
@@ -206,3 +206,6 @@ export function get3dTilesBaseUrl() {
 export function getVectorTilesBaseUrl() {
     return getBaseUrl('vectorTiles')
 }
+
+export const internalDomainRegex =
+    import.meta.env.VITE_APP_INTERNAL_DOMAIN_REGEX ?? /^https:\/\/[^/]*(bgdi|admin)\.ch/
diff --git a/src/modules/menu/components/advancedTools/ImportFile/ImportFileOnlineTab.vue b/src/modules/menu/components/advancedTools/ImportFile/ImportFileOnlineTab.vue
index 2773f8fb2..25d594cea 100644
--- a/src/modules/menu/components/advancedTools/ImportFile/ImportFileOnlineTab.vue
+++ b/src/modules/menu/components/advancedTools/ImportFile/ImportFileOnlineTab.vue
@@ -1,9 +1,9 @@
 <script setup>
-import axios, { AxiosError } from 'axios'
+import { AxiosError } from 'axios'
 import { computed, onMounted, ref, toRefs, watch } from 'vue'
 import { useStore } from 'vuex'
 
-import getFileThroughProxy from '@/api/file-proxy.api'
+import { getFileFromUrl } from '@/api/files.api'
 import ImportFileButtons from '@/modules/menu/components/advancedTools/ImportFile/ImportFileButtons.vue'
 import { handleFileContent } from '@/modules/menu/components/advancedTools/ImportFile/utils'
 import TextInput from '@/utils/components/TextInput.vue'
@@ -79,20 +79,9 @@ async function loadFile() {
         return
     }
     loading.value = true
-    let response
 
     try {
-        // catching locally the first error, so that we may decide to use service-proxy if the error was network related
-        try {
-            response = await axios.get(fileUrl.value, { timeout: REQUEST_TIMEOUT })
-        } catch (error) {
-            if (error instanceof AxiosError) {
-                log.debug('Failed to retrieve file directly, trying to go through service-proxy')
-                response = await getFileThroughProxy(fileUrl.value, { timeout: REQUEST_TIMEOUT })
-            } else {
-                throw error
-            }
-        }
+        const response = await getFileFromUrl(fileUrl.value, { timeout: REQUEST_TIMEOUT })
         if (response.status !== 200) {
             throw new Error(`Failed to fetch ${fileUrl.value}; status_code=${response.status}`)
         }
diff --git a/src/store/plugins/load-gpx-data.plugin.js b/src/store/plugins/load-gpx-data.plugin.js
index 2c3f2579b..f84319102 100644
--- a/src/store/plugins/load-gpx-data.plugin.js
+++ b/src/store/plugins/load-gpx-data.plugin.js
@@ -3,10 +3,9 @@
  * it here
  */
 
-import axios from 'axios'
 import GPX from 'ol/format/GPX'
 
-import { proxifyUrl } from '@/api/file-proxy.api'
+import { getFileFromUrl } from '@/api/files.api'
 import GPXLayer from '@/api/layers/GPXLayer.class'
 import log from '@/utils/logging'
 
@@ -20,7 +19,7 @@ const dispatcher = { dispatcher: 'load-gpx-data.plugin' }
 async function loadGpx(store, gpxLayer) {
     log.debug(`Loading data for added GPX layer`, gpxLayer)
     try {
-        const response = await axios.get(proxifyUrl(gpxLayer.gpxFileUrl))
+        const response = await getFileFromUrl(gpxLayer.gpxFileUrl)
         const gpxContent = response.data
         const gpxParser = new GPX()
         const metadata = gpxParser.readMetadata(gpxContent)
diff --git a/src/utils/kmlUtils.js b/src/utils/kmlUtils.js
index ec3b71425..194f61614 100644
--- a/src/utils/kmlUtils.js
+++ b/src/utils/kmlUtils.js
@@ -454,7 +454,7 @@ export function getEditableFeatureFromKmlFeature(kmlFeature, kmlLayer, available
 const nonGeoadminIconUrls = new Set()
 export function iconUrlProxyFy(url, corsIssueCallback = null) {
     // We only proxyfy URL that are not from our backend.
-    if (!/^(https:\/\/[^/]*(bgdi\.ch|geo\.admin\.ch)|http:\/\/localhost)/.test(url)) {
+    if (!/^(https:\/\/[^/]*(bgdi\.ch|geo\.admin\.ch)|https?:\/\/localhost)/.test(url)) {
         const proxyUrl = proxifyUrl(url)
         // Only perform the CORS check if we have a callback and it has not yet been done
         if (!nonGeoadminIconUrls.has(url) && corsIssueCallback) {
diff --git a/src/utils/utils.js b/src/utils/utils.js
index 6d998503f..18060f46c 100644
--- a/src/utils/utils.js
+++ b/src/utils/utils.js
@@ -1,5 +1,6 @@
 import { LineString, Point, Polygon } from 'ol/geom'
 
+import { internalDomainRegex } from '@/config/baseUrl.config'
 import { toLv95 } from '@/utils/coordinates/coordinateUtils'
 import log from '@/utils/logging'
 import { format } from '@/utils/numberUtils'
@@ -249,3 +250,13 @@ export function humanFileSize(size) {
     const i = size == 0 ? 0 : Math.floor(Math.log(size) / Math.log(1024))
     return (size / Math.pow(1024, i)).toFixed(2) * 1 + ' ' + ['B', 'kB', 'MB', 'GB', 'TB'][i]
 }
+
+/**
+ * Check if the given url is an internal URL (from bgdi.ch or admin.ch subdomain)
+ *
+ * @param {string} url
+ * @returns {boolean} Returns true if the url is part of an internal server
+ */
+export function isInternalUrl(url) {
+    return internalDomainRegex.test(url)
+}
diff --git a/tests/cypress/tests-e2e/importToolFile.cy.js b/tests/cypress/tests-e2e/importToolFile.cy.js
index e3dce56be..91e917652 100644
--- a/tests/cypress/tests-e2e/importToolFile.cy.js
+++ b/tests/cypress/tests-e2e/importToolFile.cy.js
@@ -21,7 +21,10 @@ describe('The Import File Tool', () => {
         // Test the import of an online KML file
         cy.log('Test online import')
         const localKmlFile = 'import-tool/external-kml-file.kml'
-        const validOnlineUrl = 'http://example.com/valid-kml-file.kml'
+        const validOnlineUrl = 'https://example.com/valid-kml-file.kml'
+        cy.intercept('HEAD', validOnlineUrl, {
+            statusCode: 200,
+        }).as('headKmlFile')
         cy.intercept('GET', validOnlineUrl, {
             fixture: localKmlFile,
         }).as('getKmlFile')
@@ -57,7 +60,10 @@ describe('The Import File Tool', () => {
         //----------------------------------------------------------------------
         cy.log('Test adding another external online KML layer')
         const secondLocalKmlFile = 'import-tool/second-external-kml-file.kml'
-        const secondValidOnlineUrl = 'http://example.com/second-valid-kml-file.kml'
+        const secondValidOnlineUrl = 'https://example.com/second-valid-kml-file.kml'
+        cy.intercept('HEAD', secondValidOnlineUrl, {
+            statusCode: 200,
+        }).as('headSecondKmlFile')
         cy.intercept('GET', secondValidOnlineUrl, {
             fixture: secondLocalKmlFile,
         }).as('getSecondKmlFile')
@@ -231,22 +237,47 @@ describe('The Import File Tool', () => {
         cy.get('[data-cy="menu-section-active-layers"]:visible').children().should('have.length', 1)
         cy.get(`[data-cy^="active-layer-name-${secondValidOnlineUrl}-"]`).should('be.visible')
         cy.get('[data-cy^="button-loading-metadata-spinner-"]').should('not.exist')
+
+        // Test the import of an online KML file that don't support CORS
+        cy.log('Test online import - Non CORS server')
+        const validOnlineNonCORSUrl = 'https://example.com/valid-kml-file-non-cors.kml'
+        cy.intercept('HEAD', validOnlineNonCORSUrl, { forceNetworkError: true }).as(
+            'headKmlCorsFile'
+        )
+        cy.intercept('GET', proxifyUrl(validOnlineNonCORSUrl), {
+            fixture: localKmlFile,
+        }).as('getKmlCorsFile')
+
+        cy.openMenuIfMobile()
+        cy.get('[data-cy="menu-tray-tool-section"]:visible').click()
+        cy.get('[data-cy="menu-advanced-tools-import-file"]:visible').click()
+
+        // Type a valid online GPX file URL
+        cy.get('[data-cy="text-input"]:visible').type(validOnlineNonCORSUrl)
+        cy.get('[data-cy="import-file-load-button"]:visible').click()
+        cy.wait('@headKmlCorsFile')
+        cy.wait('@getKmlCorsFile')
+        cy.readStoreValue('state.layers.activeLayers').should('have.length', 2)
     })
     it('Import KML file error handling', () => {
         const outOfBoundKMLFile = 'import-tool/paris.kml'
         const emptyKMLFile = 'import-tool/empty.kml'
 
-        const invalidFileOnlineUrl = 'http://example.com/invalid-file.kml'
+        cy.intercept('HEAD', 'https://example.com/*', {
+            statusCode: 200,
+        })
+
+        const invalidFileOnlineUrl = 'https://example.com/invalid-file.kml'
         cy.intercept('GET', invalidFileOnlineUrl, {
             body: `<html>Not a KML</html>`,
         }).as('getInvalidKmlFile')
 
-        const onlineUrlNotReachable = 'http://example.com/kml-file.kml'
+        const onlineUrlNotReachable = 'https://example.com/kml-file.kml'
         cy.intercept('GET', onlineUrlNotReachable, {
             statusCode: 403,
         }).as('getNoReachableKmlFile')
 
-        const outOfBoundKMLUrl = 'http://example.com/out-of-bound-kml-file.kml'
+        const outOfBoundKMLUrl = 'https://example.com/out-of-bound-kml-file.kml'
         cy.intercept('GET', outOfBoundKMLUrl, {
             fixture: outOfBoundKMLFile,
         }).as('getOutOfBoundKmlFile')
@@ -387,7 +418,7 @@ describe('The Import File Tool', () => {
         //----------------------------------------------------------------------
         // Attach an online empty KML file
         cy.log('Test add an online empty KML file')
-        const emptyKMLUrl = 'http://example.com/empty-kml-file.kml'
+        const emptyKMLUrl = 'https://example.com/empty-kml-file.kml'
         cy.intercept('GET', emptyKMLUrl, {
             fixture: emptyKMLFile,
         }).as('getEmptyKmlFile')
@@ -501,9 +532,10 @@ describe('The Import File Tool', () => {
 
         // Test the import of an online GPX file
         cy.log('Test online import')
-        const validOnlineUrl = 'http://example.com/valid-gpx-file.gpx'
+        const validOnlineUrl = 'https://example.com/valid-gpx-file.gpx'
         const gpxOnlineLayerId = `GPX|${validOnlineUrl}`
-        cy.intercept('GET', proxifyUrl(validOnlineUrl), {
+        cy.intercept('HEAD', validOnlineUrl, { statusCode: 200 })
+        cy.intercept('GET', validOnlineUrl, {
             fixture: gpxFileFixture,
         }).as('getGpxFile')
 
@@ -570,5 +602,27 @@ describe('The Import File Tool', () => {
         cy.openMenuIfMobile()
         cy.get(`[data-cy^="button-remove-layer-${gpxOnlineLayerId}-"]:visible`).click()
         cy.readStoreValue('state.layers.activeLayers').should('be.empty')
+
+        // Test the import of an online GPX file that don't support CORS
+        cy.log('Test online import - Non CORS server')
+        const validOnlineNonCORSUrl = 'https://example.com/valid-gpx-file-non-cors.gpx'
+        const gpxOnlineLayerNonCORSId = `GPX|${validOnlineNonCORSUrl}`
+        cy.intercept('HEAD', validOnlineNonCORSUrl, { forceNetworkError: true }).as(
+            'headGpxCorsFile'
+        )
+        cy.intercept('GET', proxifyUrl(validOnlineNonCORSUrl), {
+            fixture: gpxFileFixture,
+        }).as('getGpxCorsFile')
+
+        cy.openMenuIfMobile()
+        cy.get('[data-cy="menu-tray-tool-section"]:visible').click()
+        cy.get('[data-cy="menu-advanced-tools-import-file"]:visible').click()
+
+        // Type a valid online GPX file URL
+        cy.get('[data-cy="text-input"]:visible').type(validOnlineNonCORSUrl)
+        cy.get('[data-cy="import-file-load-button"]:visible').click()
+        cy.wait('@headGpxCorsFile')
+        cy.wait('@getGpxCorsFile')
+        cy.checkOlLayer([bgLayer, gpxOnlineLayerNonCORSId])
     })
 })