fix(web): Allow configuration of read-buffer-size (#675)
This fixes the `431 Request Header Fields Too Large` error By default, the read-buffer-size is 8192, up from fiber's default of 4096. Fixes #674 Fixes #636 Supersedes #637 Supersedes #663
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TwiN
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110
README.md
110
README.md
@ -206,57 +206,58 @@ If you want to test it locally, see [Docker](#docker).
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## Configuration
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| Parameter | Description | Default |
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|:------------------------------------------------|:--------------------------------------------------------------------------------------------------------------------------------------------|:---------------------------|
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| `debug` | Whether to enable debug logs. | `false` |
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| `metrics` | Whether to expose metrics at /metrics. | `false` |
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| `storage` | [Storage configuration](#storage) | `{}` |
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| `endpoints` | List of endpoints to monitor. | Required `[]` |
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| `endpoints[].enabled` | Whether to monitor the endpoint. | `true` |
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| `endpoints[].name` | Name of the endpoint. Can be anything. | Required `""` |
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| `endpoints[].group` | Group name. Used to group multiple endpoints together on the dashboard. <br />See [Endpoint groups](#endpoint-groups). | `""` |
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| `endpoints[].url` | URL to send the request to. | Required `""` |
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| `endpoints[].method` | Request method. | `GET` |
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| `endpoints[].conditions` | Conditions used to determine the health of the endpoint. <br />See [Conditions](#conditions). | `[]` |
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| `endpoints[].interval` | Duration to wait between every status check. | `60s` |
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| `endpoints[].graphql` | Whether to wrap the body in a query param (`{"query":"$body"}`). | `false` |
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| `endpoints[].body` | Request body. | `""` |
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| `endpoints[].headers` | Request headers. | `{}` |
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| `endpoints[].dns` | Configuration for an endpoint of type DNS. <br />See [Monitoring an endpoint using DNS queries](#monitoring-an-endpoint-using-dns-queries). | `""` |
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| `endpoints[].dns.query-type` | Query type (e.g. MX) | `""` |
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| `endpoints[].dns.query-name` | Query name (e.g. example.com) | `""` |
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| `endpoints[].ssh` | Configuration for an endpoint of type SSH. <br />See [Monitoring an endpoint using SSH](#monitoring-an-endpoint-using-ssh). | `""` |
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| `debug` | Whether to enable debug logs. | `false` |
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| `metrics` | Whether to expose metrics at /metrics. | `false` |
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| `storage` | [Storage configuration](#storage) | `{}` |
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| `endpoints` | List of endpoints to monitor. | Required `[]` |
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| `endpoints[].enabled` | Whether to monitor the endpoint. | `true` |
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| `endpoints[].name` | Name of the endpoint. Can be anything. | Required `""` |
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| `endpoints[].group` | Group name. Used to group multiple endpoints together on the dashboard. <br />See [Endpoint groups](#endpoint-groups). | `""` |
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| `endpoints[].url` | URL to send the request to. | Required `""` |
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| `endpoints[].method` | Request method. | `GET` |
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| `endpoints[].conditions` | Conditions used to determine the health of the endpoint. <br />See [Conditions](#conditions). | `[]` |
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| `endpoints[].interval` | Duration to wait between every status check. | `60s` |
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| `endpoints[].graphql` | Whether to wrap the body in a query param (`{"query":"$body"}`). | `false` |
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| `endpoints[].body` | Request body. | `""` |
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| `endpoints[].headers` | Request headers. | `{}` |
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| `endpoints[].dns` | Configuration for an endpoint of type DNS. <br />See [Monitoring an endpoint using DNS queries](#monitoring-an-endpoint-using-dns-queries). | `""` |
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| `endpoints[].dns.query-type` | Query type (e.g. MX) | `""` |
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| `endpoints[].dns.query-name` | Query name (e.g. example.com) | `""` |
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| `endpoints[].ssh` | Configuration for an endpoint of type SSH. <br />See [Monitoring an endpoint using SSH](#monitoring-an-endpoint-using-ssh). | `""` |
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| `endpoints[].ssh.username` | SSH username (e.g. example) | Required `""` |
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| `endpoints[].ssh.password` | SSH password (e.g. password) | Required `""` |
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| `endpoints[].alerts[].type` | Type of alert. <br />See [Alerting](#alerting) for all valid types. | Required `""` |
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| `endpoints[].alerts[].enabled` | Whether to enable the alert. | `true` |
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| `endpoints[].alerts[].failure-threshold` | Number of failures in a row needed before triggering the alert. | `3` |
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| `endpoints[].alerts[].success-threshold` | Number of successes in a row before an ongoing incident is marked as resolved. | `2` |
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| `endpoints[].alerts[].send-on-resolved` | Whether to send a notification once a triggered alert is marked as resolved. | `false` |
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| `endpoints[].alerts[].description` | Description of the alert. Will be included in the alert sent. | `""` |
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| `endpoints[].client` | [Client configuration](#client-configuration). | `{}` |
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| `endpoints[].ui` | UI configuration at the endpoint level. | `{}` |
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| `endpoints[].ui.hide-hostname` | Whether to hide the hostname in the result. | `false` |
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| `endpoints[].ui.hide-url` | Whether to ensure the URL is not displayed in the results. Useful if the URL contains a token. | `false` |
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| `endpoints[].ui.dont-resolve-failed-conditions` | Whether to resolve failed conditions for the UI. | `false` |
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| `endpoints[].ui.badge.reponse-time` | List of response time thresholds. Each time a threshold is reached, the badge has a different color. | `[50, 200, 300, 500, 750]` |
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| `alerting` | [Alerting configuration](#alerting). | `{}` |
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| `security` | [Security configuration](#security). | `{}` |
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| `disable-monitoring-lock` | Whether to [disable the monitoring lock](#disable-monitoring-lock). | `false` |
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| `skip-invalid-config-update` | Whether to ignore invalid configuration update. <br />See [Reloading configuration on the fly](#reloading-configuration-on-the-fly). | `false` |
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| `web` | Web configuration. | `{}` |
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| `web.address` | Address to listen on. | `0.0.0.0` |
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| `web.port` | Port to listen on. | `8080` |
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| `web.tls.certificate-file` | Optional public certificate file for TLS in PEM format. | `` |
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| `web.tls.private-key-file` | Optional private key file for TLS in PEM format. | `` |
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| `ui` | UI configuration. | `{}` |
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| `ui.title` | [Title of the document](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/title). | `Health Dashboard ǀ Gatus` |
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| `ui.description` | Meta description for the page. | `Gatus is an advanced...`. |
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| `ui.header` | Header at the top of the dashboard. | `Health Status` |
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| `ui.logo` | URL to the logo to display. | `""` |
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| `ui.link` | Link to open when the logo is clicked. | `""` |
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| `ui.buttons` | List of buttons to display below the header. | `[]` |
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| `ui.buttons[].name` | Text to display on the button. | Required `""` |
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| `ui.buttons[].link` | Link to open when the button is clicked. | Required `""` |
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| `maintenance` | [Maintenance configuration](#maintenance). | `{}` |
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| `endpoints[].alerts[].type` | Type of alert. <br />See [Alerting](#alerting) for all valid types. | Required `""` |
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| `endpoints[].alerts[].enabled` | Whether to enable the alert. | `true` |
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| `endpoints[].alerts[].failure-threshold` | Number of failures in a row needed before triggering the alert. | `3` |
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| `endpoints[].alerts[].success-threshold` | Number of successes in a row before an ongoing incident is marked as resolved. | `2` |
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| `endpoints[].alerts[].send-on-resolved` | Whether to send a notification once a triggered alert is marked as resolved. | `false` |
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| `endpoints[].alerts[].description` | Description of the alert. Will be included in the alert sent. | `""` |
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| `endpoints[].client` | [Client configuration](#client-configuration). | `{}` |
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| `endpoints[].ui` | UI configuration at the endpoint level. | `{}` |
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| `endpoints[].ui.hide-hostname` | Whether to hide the hostname in the result. | `false` |
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| `endpoints[].ui.hide-url` | Whether to ensure the URL is not displayed in the results. Useful if the URL contains a token. | `false` |
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| `endpoints[].ui.dont-resolve-failed-conditions` | Whether to resolve failed conditions for the UI. | `false` |
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| `endpoints[].ui.badge.reponse-time` | List of response time thresholds. Each time a threshold is reached, the badge has a different color. | `[50, 200, 300, 500, 750]` |
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| `alerting` | [Alerting configuration](#alerting). | `{}` |
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| `security` | [Security configuration](#security). | `{}` |
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| `disable-monitoring-lock` | Whether to [disable the monitoring lock](#disable-monitoring-lock). | `false` |
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| `skip-invalid-config-update` | Whether to ignore invalid configuration update. <br />See [Reloading configuration on the fly](#reloading-configuration-on-the-fly). | `false` |
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| `web` | Web configuration. | `{}` |
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| `web.address` | Address to listen on. | `0.0.0.0` |
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| `web.port` | Port to listen on. | `8080` |
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| `web.read-buffer-size` | Buffer size for reading requests from a connection. Also limit for the maximum header size. | `8192` |
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| `web.tls.certificate-file` | Optional public certificate file for TLS in PEM format. | `` |
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| `web.tls.private-key-file` | Optional private key file for TLS in PEM format. | `` |
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| `ui` | UI configuration. | `{}` |
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| `ui.title` | [Title of the document](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/title). | `Health Dashboard ǀ Gatus` |
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| `ui.description` | Meta description for the page. | `Gatus is an advanced...`. |
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| `ui.header` | Header at the top of the dashboard. | `Health Status` |
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| `ui.logo` | URL to the logo to display. | `""` |
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| `ui.link` | Link to open when the logo is clicked. | `""` |
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| `ui.buttons` | List of buttons to display below the header. | `[]` |
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| `ui.buttons[].name` | Text to display on the button. | Required `""` |
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| `ui.buttons[].link` | Link to open when the button is clicked. | Required `""` |
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| `maintenance` | [Maintenance configuration](#maintenance). | `{}` |
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### Conditions
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@ -1909,6 +1910,17 @@ endpoints:
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</details>
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### How to fix 431 Request Header Fields Too Large error
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Depending on where your environment is deployed and what kind of middleware or reverse proxy sits in front of Gatus,
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you may run into this issue. This could be because the request headers are too large, e.g. big cookies.
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By default, `web.read-buffer-size` is set to `8192`, but increasing this value like so will increase the read buffer size:
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```yaml
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web:
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read-buffer-size: 32768
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```
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### Badges
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#### Uptime
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