Configuring Parameters

Constraint

Modifying gateway configuration parameters will interrupt services. Do this during off-peak hours or when no service is running.

Procedure

1. Go to the APIG console.

2. In the navigation pane, choose Gateways.
3. Click Access Console or the name of the target gateway.
4. Click the Parameters tab, and click Modify in the row that contains the target parameter. The configuration parameters vary depending on the gateway edition.

   Table 1 Configuration parameters

   Parameter	Description
   ratelimit_api_limits	Default request throttling value applied to all APIs. Default: 200 calls/second. The total number of times an API can be called is determined by this parameter only if no request throttling policy is bound to the API. The Max. API Requests of a request throttling policy cannot exceed the value of this parameter.
   request_body_size	Maximum size of the body that can be carried in an API request. The default value is 12 MB. The value ranges from 1 MB to 9,536 MB.
   backend_timeout	Backend response timeout. Default: 60,000 ms. Range: 1–600,000 ms.
   app_token	Determine whether to enable app_token authentication. Default: disabled. If you enable this function, an access_token can be added to the API request for authentication. app_token_expire_time: validity period of an access_token. A new access_token must be obtained before the original access_token expires. refresh_token_expire_time: the validity period of a refresh_token. A refresh_token is used to obtain a new access_token. app_token_uri: the URI used to obtain an access_token. app_token_key: the encryption key of an access token.
   app_basic	Determine whether to enable app_basic authentication. Default: disabled. After this option is enabled, users can add the header parameter Authorization and set the parameter value to "Basic + base64 (appkey + : + appsecret)", in which appkey and appsecret are the key and secret of a credential.
   app_secret	Determine whether to enable app_secret authentication. Default: disabled. If you enable this function, the X-HW-ID and X-HW-AppKey parameters can be added to the API request to carry the key and secret of a credential for authentication.
   app_route	Determine whether to support IP address–based API access. Default: disabled. If you enable this function, APIs in any group except DEFAULT can be called using IP addresses.
   backend_client_certificate	Determine whether to enable backend two-way authentication. Default: disabled. If you enable this function, you can configure two-way authentication for a backend when creating an API.
   ssl_ciphers	Supported HTTPS cipher suites. By default, all cipher suites are supported. Select cipher suites after you bind independent domain names to an API group.
   real_ip_from_xff	Determine whether to use the IP addresses in the X-Forwarded-For header for access control and request throttling. By default, the IP addresses in this header are not used. xff_index: Sequence number of an IP address in the X-Forwarded-For header. The value can be positive, negative, or 0. If the value is 0 or positive, the IP address of the corresponding index in the X-Forwarded-For header will be obtained. If the value is negative, the IP address of the indicated reverse sequence in the X-Forwarded-For header will be obtained. For example, assume that the X-Forwarded-For header of a request received by API gateway contains three IP addresses: IP1, IP2, and IP3. If the value of xff_index is 0, IP1 is obtained. If the value is 1, IP2 is obtained. If the value is –1, IP3 is obtained. If the value is –2, IP2 is obtained.
   vpc_name_modifiable	Determine whether load balance channel names can be modified. By default, the names can be modified. NOTICE: If this option is enabled, load balance channels of the current gateway cannot be managed using project-level load balance channel management APIs.
   custom_auth_header	Determine whether to support custom authentication headers. By default, custom authentication headers are not supported. If you enable this parameter, the initial values of app_auth_header and backend_sign_header are empty, same as when the parameter is disabled. If you set the Current Value of app_auth_header, the parameter with the same name as this value carries the app authentication information in the request header for APIs that use app authentication. If you set the Current Value of backend_sign_header, the parameter with the same name as this value carries the signature information in the backend request header for APIs bound with an HMAC or Basic Auth signature key policy. NOTICE: Configuring this parameter will affect all APIs that use app authentication or are bound with an HMAC or Basic Auth signature key policy in the gateway.
   custom_log	Whether to enable custom logs. Default: disabled. Once enabled, values of specified parameters will be printed in specified locations of calling logs for all APIs in the gateway. After this function is enabled, click Modify, and then click Add to add the parameters to print in calling logs. NOTICE: Custom logs print only the requests initiated from clients and do not print the constants and system parameters defined in APIG. Custom logs can have a maximum of 10 fields, with a total size of not more than 2 KB. Some special characters in parameter values will be encoded. For example, the plus sign (+) will be encoded as a space, double quotation marks (") encoded as \x22, and a backslash (\) encoded as \x5C.