Intercepting a request using HttpSend (like in <https://ktor.io/docs/http-send.html>) , what would b...

# ktor

[harry248]

Intercepting a request using HttpSend (like in https://ktor.io/docs/http-send.html) , what would be the recommended way to prevent the request from being sent. Throwing an exception?

[Aleksei Tirman [JB]]

Could you please describe what do you want to accomplish? What could be a reason to not send a request?

[harry248]

We would like to skip a request if the client already knows that it will get a 401 response (because we persisted the expiration date of the access token) and instead directly do the token refresh call.

[Aleksei Tirman [JB]]

You can modify request builder before sending a request to refresh a token. Here is an example:

val client = HttpClient(Apache)

client.plugin(HttpSend).intercept { builder ->
    val newBuilder = HttpRequestBuilder().takeFromWithExecutionContext(builder) // Copy builder with a job

    // modify builder
    newBuilder.url.encodedPath = "/post"
    newBuilder.method = <http://HttpMethod.Post|HttpMethod.Post>

    execute(newBuilder) // Execute request
}

val r = client.get("<https://httpbin.org/get>")
println(r)

[harry248]

@Aleksei Tirman [JB] takeFromWithExecutionContext() is an internal API but it seem to work with takeFrom(). Is this the same?

[Aleksei Tirman [JB]]

The takeFrom is marked with InternalAPI too. You can opt-in for it. The difference is that an execution context isn’t copied with takeFrom .

[Aleksei Tirman [JB]]

Probably it’s better to use takeFrom .

[harry248]

Oh interesting... the IDE isn't complaining with takeFrom().

[harry248]

I see... it already uses the @OptIn annotation. Ok, then I will stick with takeFrom().

[harry248]

Thanks!