# BackendResponse
## Properties
**address** | Option<**String**> | A hostname, IPv4, or IPv6 address for the backend. This is the preferred way to specify the location of your backend. |
**auto_loadbalance** | Option<**bool**> | Whether or not this backend should be automatically load balanced. If true, all backends with this setting that don't have a `request_condition` will be selected based on their `weight`. |
**between_bytes_timeout** | Option<**i32**> | Maximum duration in milliseconds that Fastly will wait while receiving no data on a download from a backend. If exceeded, the response received so far will be considered complete and the fetch will end. May be set at runtime using `bereq.between_bytes_timeout`. |
**client_cert** | Option<**String**> | Unused. |
**comment** | Option<**String**> | A freeform descriptive note. |
**connect_timeout** | Option<**i32**> | Maximum duration in milliseconds to wait for a connection to this backend to be established. If exceeded, the connection is aborted and a synthethic `503` response will be presented instead. May be set at runtime using `bereq.connect_timeout`. |
**first_byte_timeout** | Option<**i32**> | Maximum duration in milliseconds to wait for the server response to begin after a TCP connection is established and the request has been sent. If exceeded, the connection is aborted and a synthethic `503` response will be presented instead. May be set at runtime using `bereq.first_byte_timeout`. |
**healthcheck** | Option<**String**> | The name of the healthcheck to use with this backend. |
**hostname** | Option<**String**> | The hostname of the backend. May be used as an alternative to `address` to set the backend location. |
**ipv4** | Option<**String**> | IPv4 address of the backend. May be used as an alternative to `address` to set the backend location. |
**ipv6** | Option<**String**> | IPv6 address of the backend. May be used as an alternative to `address` to set the backend location. |
**keepalive_time** | Option<**i32**> | How long in seconds to keep a persistent connection to the backend between requests. |
**max_conn** | Option<**i32**> | Maximum number of concurrent connections this backend will accept. |
**max_tls_version** | Option<**String**> | Maximum allowed TLS version on SSL connections to this backend. If your backend server is not able to negotiate a connection meeting this constraint, a synthetic `503` error response will be generated. |
**min_tls_version** | Option<**String**> | Minimum allowed TLS version on SSL connections to this backend. If your backend server is not able to negotiate a connection meeting this constraint, a synthetic `503` error response will be generated. |
**name** | Option<**String**> | The name of the backend. |
**override_host** | Option<**String**> | If set, will replace the client-supplied HTTP `Host` header on connections to this backend. Applied after VCL has been processed, so this setting will take precedence over changing `bereq.http.Host` in VCL. |
**port** | Option<**i32**> | Port on which the backend server is listening for connections from Fastly. Setting `port` to 80 or 443 will also set `use_ssl` automatically (to false and true respectively), unless explicitly overridden by setting `use_ssl` in the same request. |
**request_condition** | Option<**String**> | Name of a Condition, which if satisfied, will select this backend during a request. If set, will override any `auto_loadbalance` setting. By default, the first backend added to a service is selected for all requests. |
**shield** | Option<**String**> | Identifier of the POP to use as a [shield](https://docs.fastly.com/en/guides/shielding). |
**ssl_ca_cert** | Option<**String**> | CA certificate attached to origin. |
**ssl_cert_hostname** | Option<**String**> | Overrides `ssl_hostname`, but only for cert verification. Does not affect SNI at all. |
**ssl_check_cert** | Option<**bool**> | Be strict on checking SSL certs. | [default to true]
**ssl_ciphers** | Option<**String**> | List of [OpenSSL ciphers](https://www.openssl.org/docs/manmaster/man1/ciphers.html) to support for connections to this origin. If your backend server is not able to negotiate a connection meeting this constraint, a synthetic `503` error response will be generated. |
**ssl_client_cert** | Option<**String**> | Client certificate attached to origin. |
**ssl_client_key** | Option<**String**> | Client key attached to origin. |
**ssl_hostname** | Option<**String**> | Use `ssl_cert_hostname` and `ssl_sni_hostname` to configure certificate validation. |
**ssl_sni_hostname** | Option<**String**> | Overrides `ssl_hostname`, but only for SNI in the handshake. Does not affect cert validation at all. |
**use_ssl** | Option<**bool**> | Whether or not to require TLS for connections to this backend. |
**weight** | Option<**i32**> | Weight used to load balance this backend against others. May be any positive integer. If `auto_loadbalance` is true, the chance of this backend being selected is equal to its own weight over the sum of all weights for backends that have `auto_loadbalance` set to true. |
**created_at** | Option<**String**> | Date and time in ISO 8601 format. | [readonly]
**deleted_at** | Option<**String**> | Date and time in ISO 8601 format. | [readonly]
**updated_at** | Option<**String**> | Date and time in ISO 8601 format. | [readonly]
**service_id** | Option<**String**> | | [readonly]
**version** | Option<**i32**> | | [readonly]
**locked** | Option<**bool**> | Indicates whether the version of the service this backend is attached to accepts edits. | [readonly]
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