"Web server logging" supported for App services

Question

"Web server logging" supported for App services

Rachana Pole 10

Hi team,

I want to know how to enable HTTP logging for all types of Azure App services.

I believe we need to enable "Web server logging" under "App Service logs" but Currently I see this option only for "Logic apps" and not available for "Function app" or "Web apps" on UI. But I am able to configure it via REST API for all types.

Can you please share details on :

Is "web server logging" still supported for all types of app services?
If yes, how can we enable all app services? Also, provide the Azure documentation for steps.
If not, what is the alternate configuration? Also, provide the Azure documentation for the support details and steps.

Shree Hima Bindu Maganti 4,775 Reputation points Microsoft External Staff Moderator

2024-12-30T19:02:29.6533333+00:00
Hi Rachana Pole
Welcome to the Microsoft Q&A Platform!
Is "Web Server Logging" supported for all types of App Services?
Yes, Web Server Logging is supported for Web Apps, API Apps, and Function Apps. However, UI options may not be visible for all types and require alternate methods for configuration.
For Web Apps and API Apps.

Azure Portal> Go to the Azure Portal>Navigate to your App Service>Under Monitoring, select App Service logs.
Enable Web Server Logging and specify the storage location (File System or Azure Storage).
Azure CLI
az webapp log config --name <app-name> --resource-group <resource-group> --web-server-logging storage
REST API:

Endpoint: https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Web/sites/{appName}/config/logs?api-version=2021-01-01
Method: PUT

{ "properties": { "httpLogs": { "fileSystem": { "enabled": true, "retentionInDays": 7, "retentionInMb": 35 } } } }

For Function Apps:

Configure Diagnostic Settings to enable HTTP logging.

az monitor diagnostic-settings create --resource <resource-id> --name "FunctionAppLogs" \ --workspace <log-analytics-workspace-id> --logs '[{"category": "FunctionAppLogs", "enabled": true}]'

REST API: Use the Diagnostic Settings API

Endpoint: https://management.azure.com/{resourceId}/providers/microsoft.insights/diagnosticSettings/{name}?api-version=2017-05-01-preview
ref:Diagnostics Logging for Azure App Service

Application Insights Overview

Azure Monitor Diagnostic Settings
If the answer is helpful, please click ACCEPT ANSWER and kindly upvote it so that other people who faces similar issue may get benefitted from it.
Rachana Pole 10 Reputation points

2025-01-02T07:28:30.44+00:00

Configuring the Web app and logic app using the command provided above, the CLI does not work as expected.
Shree Hima Bindu Maganti 4,775 Reputation points Microsoft External Staff Moderator

2025-01-06T17:46:35.51+00:00

Hi Rachana Pole

Following up to see if you have chance to check previous response and help us with requested information is helpful.
Shree Hima Bindu Maganti 4,775 Reputation points Microsoft External Staff Moderator

2025-01-07T18:01:41.94+00:00

Hi Rachana Pole

Following up to see if you have chance to check previous response and help us with requested information is helpful.

2 answers

Your answer

Shree Hima Bindu Maganti 4,775 Reputation points Microsoft External Staff Moderator

2024-12-30T19:02:29.6533333+00:00

Hi Rachana Pole
Welcome to the Microsoft Q&A Platform!
Is "Web Server Logging" supported for all types of App Services?
Yes, Web Server Logging is supported for Web Apps, API Apps, and Function Apps. However, UI options may not be visible for all types and require alternate methods for configuration.
For Web Apps and API Apps.

Azure Portal> Go to the Azure Portal>Navigate to your App Service>Under Monitoring, select App Service logs.
Enable Web Server Logging and specify the storage location (File System or Azure Storage).
Azure CLI
az webapp log config --name <app-name> --resource-group <resource-group> --web-server-logging storage
REST API:

Endpoint: https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Web/sites/{appName}/config/logs?api-version=2021-01-01
Method: PUT

{ "properties": { "httpLogs": { "fileSystem": { "enabled": true, "retentionInDays": 7, "retentionInMb": 35 } } } }

For Function Apps:

Configure Diagnostic Settings to enable HTTP logging.

az monitor diagnostic-settings create --resource <resource-id> --name "FunctionAppLogs" \ --workspace <log-analytics-workspace-id> --logs '[{"category": "FunctionAppLogs", "enabled": true}]'

REST API: Use the Diagnostic Settings API

Endpoint: https://management.azure.com/{resourceId}/providers/microsoft.insights/diagnosticSettings/{name}?api-version=2017-05-01-preview
ref:Diagnostics Logging for Azure App Service

Application Insights Overview

Azure Monitor Diagnostic Settings
If the answer is helpful, please click ACCEPT ANSWER and kindly upvote it so that other people who faces similar issue may get benefitted from it.
Rachana Pole 10 Reputation points

2025-01-02T07:28:30.44+00:00

Configuring the Web app and logic app using the command provided above, the CLI does not work as expected.
Shree Hima Bindu Maganti 4,775 Reputation points Microsoft External Staff Moderator

2025-01-06T17:46:35.51+00:00

Hi Rachana Pole

Following up to see if you have chance to check previous response and help us with requested information is helpful.
Shree Hima Bindu Maganti 4,775 Reputation points Microsoft External Staff Moderator

2025-01-07T18:01:41.94+00:00

Hi Rachana Pole

Following up to see if you have chance to check previous response and help us with requested information is helpful.

Answer 1

Hi Rachana Pole
Thankyou for your Response.
The --web-server-logging parameter in Azure CLI does not support storage as a value. Allowed values are off and filesystem.
Enable Logging to Filesystem
az webapp log config --name <app-name> --resource-group <resource-group> --web-server-logging filesystem
Disable Logging
az webapp log config --name <app-name> --resource-group <resource-group> --web-server-logging off

API Endpoint
https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Web/sites/{appName}/config/logs?api-version=2021-01-01
Request Body

{
  "properties": {
    "httpLogs": {
      "azureBlobStorage": {
        "enabled": true,
        "sasUrl": "<sas-url-for-blob-storage>",
        "retentionInDays": 7
      }
    }
  }
}

Generate a SAS token for your Blob Storage container and replace <sas-url-for-blob-storage> with the full URL.

https://learn.microsoft.com/en-us/cli/azure/webapp/log?view=azure-cli-latest
https://learn.microsoft.com/en-us/azure/app-service/monitor-app-service
https://learn.microsoft.com/en-us/rest/api/storageservices/create-user-delegation-sas
If the answer is helpful, please click Accept Answer and kindly upvote it

Answer 2

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"Web server logging" supported for App services

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