The request body sent to service backend by the Client contains many fields. If you want to modify the content of the request body, you can do so via custom request body plugin.
The custom request body plugin applies during the request process. The request body rewriting service can be deployed in SCF, on the public network, or in a VPC. API Gateway will forward the request content to the request body rewriting service after receiving it from the client. The rewriting service will send the content of the request body to API Gateway after modifying it. Then, API Gateway will forward the modified request body to the service backend.
Prerequisites
For verification services deployed in SCF, you need to enable the SCF service.
Directions
Step 1. Create a function to modify the request body
For verification functions deployed on the public network or in a VPC, you can skip this step.
2. On the left sidebar, click Plugin > Custom Plugin to enter the custom plugin list page.
3. Click Create in the top-left corner of the page to create a custom request body plugin.
For verification services deployed in SCF, you need to enter the following data when creating the custom request body plugin:
Parameter
Required
Description
Function
Yes
Select the namespace, name, and version of the function that is used to modify the request body.
Backend timeout
Yes
Set the backend timeout that API Gateway forwards the request to the function that is used to modify the request body. The maximum time limit is 30 minutes. When no response is returned before the timeout after API Gateway calls the function, API Gateway will end the call and return an error message.
Custom content
Yes
Set the request content sent by API Gateway to the function used to modify the request body. You can select Header, Body, and Query. The request content not selected will not be modified and will be forwarded to the service backend as is.
Base64 Encoding
Yes
Specify whether to forward the request content to the function after applying Base64 encoding. Generally, it is applicable to binary content.
For verification services deployed on the public network, you need to enter the following data when creating the custom verification plugin:
Parameter
Required
Description
Request method
Yes
Request method of the custom request body function, which can be GET, POST, PUT, DELETE, HEAD, and ANY.
Public network service
Yes
Access address of the request body service, which can be an HTTP or HTTPS address.
Path match mode
Yes
It can be backend path or full path match.
Backend path match: The configured path is used to request the service.
Full path match: The overlapping part is used to request the service. For example, if the configured API path is `/a/` and the request path is `/a/b`, then the path transferred to the service will be `/b` after full path match is enabled.
For verification services deployed in a VPC, you need to enter the following data when creating the custom verification plugin:
Parameter
Required
Description
VPC
Yes
Select the VPC of the custom request rewriting service.
Request method
Yes
Request method of the custom request rewriting service, which can be GET, POST, PUT, DELETE, HEAD, and ANY.
Backend address
Yes
Access address of the custom request body service, which can be an HTTP or HTTPS address.
Step 3. Bind the API
1. Select the plugin created in step 2 from the list. Click Bind API in the Operation column.
2. In the Bind API pop-up window, select the service, environment, and the target API.
3. Click OK to bind the plugin to the API. At this time, the configuration of the plugin has taken effect for the API.
How to Write Custom Request Body Function
Returned value definition
The custom request body plugin of API Gateway needs to receive the response in a certain format returned by the custom request body SCF. The specific format is as follows:
{
"replace_headers":{
"header1":"header1-value",
"header2":"header2-value"
},
"remove_headers":[
"header3",
"header4"
],
"replace_body":"hello",
"replace_querys":{
"query1":"query1-value",
"query2":"query2-value"
},
"remove_querys":[
"query3",
"query4"
]
}
Demo for Python
For more information on how to write the function that is used to modify the request body in Python, see Custom Request Body Demo for Python.
"is_base64_encoded":true,// Whether to forward the request content to the SCF after applying Base64 encoding
"is_send_req_body":true,// Whether to send the request Body content to the SCF
"is_send_req_headers":true,// Whether to send the request Header content to the SCF
"is_send_req_querys":true,// Whether to send the request Query content to the SCF
"user_id":1253970226// appid
}
Notes
Binding a custom plugin to the API means creating a trigger for the SCF to trigger the API. Deleting the trigger on the SCF side means unbinding the plugin from the API.
For now, the custom request body plugin only supports event-triggered function and does not support HTTP-triggered function.
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