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fix: Configure API proxy with dynamic BACKEND_URL #829

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Merged
Avijit-Microsoft merged 5 commits into from
Apr 28, 2026
Merged

fix: Configure API proxy with dynamic BACKEND_URL #829

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16dac5b
ensure BACKEND_URL environment variable is set for API proxy
Ragini-Microsoft Apr 27, 2026
521db3c
fix: update backend URL to use actual ACI IP/FQDN from deployment out…
Ragini-Microsoft Apr 28, 2026
c352d61
apply API proxy middleware based on BACKEND_URL
Ragini-Microsoft Apr 28, 2026
aed5114
conditionally log backend URL when starting server
Ragini-Microsoft Apr 28, 2026
85ff335
update ACI backend URL construction for improved clarity
Ragini-Microsoft Apr 28, 2026
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10 changes: 4 additions & 6 deletions infra/main.bicep
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Original file line number Diff line number Diff line change
Expand Up @@ -914,13 +914,11 @@ module webServerFarm 'br/public:avm/res/web/serverfarm:0.7.0' = {

// ========== Web App ========== //
var webSiteResourceName = 'app-${solutionSuffix}'
// Backend URL: Use ACI IP (private or public) or FQDN depending on networking mode
var aciPrivateIpFallback = '10.0.4.4'
var aciPublicFqdnFallback = '${containerInstanceName}.${solutionLocation}.azurecontainer.io'
// For private networking use IP, for public use FQDN
// Backend URL: Use actual ACI IP/FQDN from deployment outputs
// This also creates an implicit dependency ensuring ACI deploys before the web app
var aciBackendUrl = enablePrivateNetworking
? 'http://${aciPrivateIpFallback}:8000'
: 'http://${aciPublicFqdnFallback}:8000'
? 'http://${containerInstance.outputs.ipAddress}:8000'
: 'http://${containerInstance.outputs.fqdn}:8000'
module webSite 'modules/web-sites.bicep' = {
name: take('module.web-sites.${webSiteResourceName}', 64)
params: {
Expand Down
16 changes: 7 additions & 9 deletions infra/main.json
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
"_generator": {
"name": "bicep",
"version": "0.42.1.51946",
"templateHash": "12441959736083561218"
"templateHash": "9315041614692254935"
},
"name": "Intelligent Content Generation Accelerator",
"description": "Solution Accelerator for multimodal marketing content generation using Microsoft Agent Framework.\n"
Expand Down Expand Up @@ -383,9 +383,6 @@
"cosmosDBProductsContainer": "products",
"webServerFarmResourceName": "[format('asp-{0}', variables('solutionSuffix'))]",
"webSiteResourceName": "[format('app-{0}', variables('solutionSuffix'))]",
"aciPrivateIpFallback": "10.0.4.4",
"aciPublicFqdnFallback": "[format('{0}.{1}.azurecontainer.io', variables('containerInstanceName'), variables('solutionLocation'))]",
"aciBackendUrl": "[if(parameters('enablePrivateNetworking'), format('http://{0}:8000', variables('aciPrivateIpFallback')), format('http://{0}:8000', variables('aciPublicFqdnFallback')))]",
"containerInstanceName": "[format('aci-{0}', variables('solutionSuffix'))]"
},
"resources": {
Expand Down Expand Up @@ -24915,8 +24912,8 @@
},
"dependsOn": [
"aiFoundryAiServices",
"[format('avmPrivateDnsZones[{0}]', variables('dnsZoneIndex').openAI)]",
"[format('avmPrivateDnsZones[{0}]', variables('dnsZoneIndex').cognitiveServices)]",
"[format('avmPrivateDnsZones[{0}]', variables('dnsZoneIndex').openAI)]",
"virtualNetwork"
]
},
Expand Down Expand Up @@ -42336,7 +42333,7 @@
},
"virtualNetworkSubnetId": "[if(parameters('enablePrivateNetworking'), createObject('value', reference('virtualNetwork').outputs.webSubnetResourceId.value), createObject('value', null()))]",
"configs": {
"value": "[concat(createArray(createObject('name', 'appsettings', 'properties', createObject('DOCKER_REGISTRY_SERVER_URL', format('https://{0}.azurecr.io', variables('acrResourceName')), 'BACKEND_URL', variables('aciBackendUrl'), 'AZURE_CLIENT_ID', reference('userAssignedIdentity').outputs.clientId.value), 'applicationInsightResourceId', if(parameters('enableMonitoring'), reference('applicationInsights').outputs.resourceId.value, null()))), if(parameters('enableMonitoring'), createArray(createObject('name', 'logs', 'properties', createObject())), createArray()))]"
"value": "[concat(createArray(createObject('name', 'appsettings', 'properties', createObject('DOCKER_REGISTRY_SERVER_URL', format('https://{0}.azurecr.io', variables('acrResourceName')), 'BACKEND_URL', if(parameters('enablePrivateNetworking'), format('http://{0}:8000', reference('containerInstance').outputs.ipAddress.value), format('http://{0}:8000', reference('containerInstance').outputs.fqdn.value)), 'AZURE_CLIENT_ID', reference('userAssignedIdentity').outputs.clientId.value), 'applicationInsightResourceId', if(parameters('enableMonitoring'), reference('applicationInsights').outputs.resourceId.value, null()))), if(parameters('enableMonitoring'), createArray(createObject('name', 'logs', 'properties', createObject())), createArray()))]"
},
"enableMonitoring": {
"value": "[parameters('enableMonitoring')]"
Expand All @@ -42363,7 +42360,7 @@
"_generator": {
"name": "bicep",
"version": "0.42.1.51946",
"templateHash": "18300393946144087310"
"templateHash": "10464081739325272474"
}
},
"definitions": {
Expand Down Expand Up @@ -43402,7 +43399,7 @@
"_generator": {
"name": "bicep",
"version": "0.42.1.51946",
"templateHash": "1934732677721164061"
"templateHash": "904290865426801162"
},
"name": "Site App Settings",
"description": "This module deploys a Site App Setting."
Expand Down Expand Up @@ -43515,7 +43512,7 @@
"type": "Microsoft.Web/sites/config",
"apiVersion": "2025-03-01",
"name": "[format('{0}/{1}', parameters('appName'), parameters('name'))]",
"properties": "[union(parameters('properties'), parameters('currentAppSettings'), if(and(not(empty(parameters('storageAccountResourceId'))), not(parameters('storageAccountUseIdentityAuthentication'))), createObject('AzureWebJobsStorage', format('DefaultEndpointsProtocol=https;AccountName={0};AccountKey={1};EndpointSuffix={2}', last(split(parameters('storageAccountResourceId'), '/')), listKeys('storageAccount', '2025-08-01').keys[0].value, environment().suffixes.storage)), if(and(not(empty(parameters('storageAccountResourceId'))), parameters('storageAccountUseIdentityAuthentication')), createObject('AzureWebJobsStorage__accountName', last(split(parameters('storageAccountResourceId'), '/')), 'AzureWebJobsStorage__blobServiceUri', reference('storageAccount').primaryEndpoints.blob, 'AzureWebJobsStorage__queueServiceUri', reference('storageAccount').primaryEndpoints.queue, 'AzureWebJobsStorage__tableServiceUri', reference('storageAccount').primaryEndpoints.table), createObject())), if(not(empty(parameters('applicationInsightResourceId'))), createObject('APPLICATIONINSIGHTS_CONNECTION_STRING', reference('applicationInsights').ConnectionString), createObject()), variables('loggingProperties'))]",
"properties": "[union(parameters('currentAppSettings'), parameters('properties'), if(and(not(empty(parameters('storageAccountResourceId'))), not(parameters('storageAccountUseIdentityAuthentication'))), createObject('AzureWebJobsStorage', format('DefaultEndpointsProtocol=https;AccountName={0};AccountKey={1};EndpointSuffix={2}', last(split(parameters('storageAccountResourceId'), '/')), listKeys('storageAccount', '2025-08-01').keys[0].value, environment().suffixes.storage)), if(and(not(empty(parameters('storageAccountResourceId'))), parameters('storageAccountUseIdentityAuthentication')), createObject('AzureWebJobsStorage__accountName', last(split(parameters('storageAccountResourceId'), '/')), 'AzureWebJobsStorage__blobServiceUri', reference('storageAccount').primaryEndpoints.blob, 'AzureWebJobsStorage__queueServiceUri', reference('storageAccount').primaryEndpoints.queue, 'AzureWebJobsStorage__tableServiceUri', reference('storageAccount').primaryEndpoints.table), createObject())), if(not(empty(parameters('applicationInsightResourceId'))), createObject('APPLICATIONINSIGHTS_CONNECTION_STRING', reference('applicationInsights').ConnectionString), createObject()), variables('loggingProperties'))]",
"dependsOn": [
"applicationInsights",
"storageAccount"
Expand Down Expand Up @@ -44286,6 +44283,7 @@
},
"dependsOn": [
"applicationInsights",
"containerInstance",
"logAnalyticsWorkspace",
"userAssignedIdentity",
"virtualNetwork",
Expand Down
14 changes: 7 additions & 7 deletions infra/main_custom.bicep
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Original file line number Diff line number Diff line change
Expand Up @@ -947,13 +947,13 @@ module webServerFarm 'br/public:avm/res/web/serverfarm:0.7.0' = {

// ========== Web App ========== //
var webSiteResourceName = 'app-${solutionSuffix}'
// Backend URL: Use ACI IP (private or public) or FQDN depending on networking mode
var aciPrivateIpFallback = '10.0.4.4'
var aciPublicFqdnFallback = '${containerInstanceName}.${solutionLocation}.azurecontainer.io'
// For private networking use IP, for public use FQDN
var aciBackendUrl = enablePrivateNetworking
? 'http://${aciPrivateIpFallback}:8000'
: 'http://${aciPublicFqdnFallback}:8000'
// Backend URL: Use actual ACI IP/FQDN from deployment outputs
// This also creates an implicit dependency ensuring ACI deploys before the web app
var aciBackendUrl = shouldDeployACI
? (enablePrivateNetworking
? 'http://${containerInstance!.properties.ipAddress.ip}:8000'
: 'http://${containerInstance!.properties.ipAddress.fqdn}:8000')
: ''
module webSite 'modules/web-sites.bicep' = {
name: take('module.web-sites.${webSiteResourceName}', 64)
params: {
Expand Down
2 changes: 1 addition & 1 deletion infra/modules/web-sites.config.bicep
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Original file line number Diff line number Diff line change
Expand Up @@ -84,8 +84,8 @@ var loggingProperties = enableMonitoring && name == 'logs'
: {}

var expandedProperties = union(
properties,
currentAppSettings,
properties,
azureWebJobsValues,
appInsightsValues,
loggingProperties
Expand Down
16 changes: 11 additions & 5 deletions src/App/server/server.js
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Expand Up @@ -6,8 +6,11 @@ const http = require('http');
const app = express();
const PORT = process.env.PORT || 8080;

// Backend API URL (ACI private IP in VNet)
const BACKEND_URL = process.env.BACKEND_URL || 'http://10.0.4.5:8000';
// Backend API URL (injected via BACKEND_URL env var at deployment time)
if (!process.env.BACKEND_URL) {
console.error('ERROR: BACKEND_URL environment variable is not set. API proxy will not work.');
}
const BACKEND_URL = process.env.BACKEND_URL;
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// Create HTTP agent with extended keep-alive timeout for long-running SSE connections
const httpAgent = new http.Agent({
Expand All @@ -18,7 +21,8 @@ const httpAgent = new http.Agent({
});

// Proxy API requests to backend
app.use('/api', createProxyMiddleware({
if (BACKEND_URL) {
app.use('/api', createProxyMiddleware({
target: BACKEND_URL,
changeOrigin: true,
pathRewrite: {
Expand Down Expand Up @@ -51,7 +55,7 @@ app.use('/api', createProxyMiddleware({
}
}
}));

}
// Serve static files from the build directory
app.use(express.static(path.join(__dirname, 'static')));

Expand All @@ -63,7 +67,9 @@ app.get('/{*path}', (req, res) => {
// Create server with extended timeouts for SSE
const server = app.listen(PORT, () => {
console.log(`Frontend server running on port ${PORT}`);
console.log(`Proxying API requests to ${BACKEND_URL}`);
if (BACKEND_URL) {
console.log(`Proxying API requests to ${BACKEND_URL}`);
}
});

// Extend server timeouts for long-running SSE connections
Expand Down
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