Azure Api Management url rewrite for dynamic path

Question

Hi I'm having problems rewriting an Url path.

My Apim looks like: https://sample-apim-int.azure-api.net/download/

The backend: https://samplebackend.net/

I want to be able to redirect from: https://sample-apim-int.azure-api.net/download/[dynamic_content]?id=1

to: https://samplebackend.net/[dynamic_content]?id=1

dynamic_content could be any of: images, pdfs, docs ... and it is dynamic because users from backoffice could add or remove.

I have try this with no luck:
frontend
resource: /{path}

and inbound policy:

Answer 1

@Omar Amalfi Your policy looks good and I have tested the same at my end and couldn't observe any issue.
I am sharing my open API spec that I have used for testing

{  
    "openapi": "3.0.1",  
    "info": {  
        "title": "Download",  
        "description": "",  
        "version": "1.0"  
    },  
    "servers": [{  
        "url": "https://{yourapiminstancename}.azure-api.net/download"  
    }],  
    "paths": {  
        "/{dynamic_content}": {  
            "get": {  
                "summary": "dynamic_content",  
                "operationId": "dynamic-content",  
                "parameters": [{  
                    "name": "dynamic_content",  
                    "in": "path",  
                    "required": true,  
                    "schema": {  
                        "type": ""  
                    }  
                }, {  
                    "name": "id",  
                    "in": "query",  
                    "schema": {  
                        "type": ""  
                    }  
                }],  
                "responses": {  
                    "200": {  
                        "description": null  
                    }  
                }  
            }  
        }  
    },  
    "components": {  
        "securitySchemes": {  
            "apiKeyHeader": {  
                "type": "apiKey",  
                "name": "Ocp-Apim-Subscription-Key",  
                "in": "header"  
            },  
            "apiKeyQuery": {  
                "type": "apiKey",  
                "name": "subscription-key",  
                "in": "query"  
            }  
        }  
    },  
    "security": [{  
        "apiKeyHeader": []  
    }, {  
        "apiKeyQuery": []  
    }]  
}  

Policy:

<policies>  
    <inbound>  
        <base />  
        <set-backend-service base-url="https://google.com/" />  
        <rewrite-uri template="/{dynamic_content}" copy-unmatched-params="true" />  
    </inbound>  
    <backend>  
        <base />  
    </backend>  
    <outbound>  
        <base />  
    </outbound>  
    <on-error>  
        <base />  
    </on-error>  
</policies>  

While testing from the portal I have passed the dynamic content and query parameter

I have used the backend URL to be failed (returns 404 error) so the Ocp-Apim-Trace is generated and we can see what backend URL it has called.