Re: How to dry-run a http request

Hi, i
During my last eternity I used to make an entry in the /etc/hosts  pointing the URL host to 
localhost or even 127.0.0.n n>1
Thus, no mod necessary and you can have may servers on "localhost." provided you let then bind 
correctly.

Best

On 15/02/2025 16:21, Jeroen Ooms via curl-library wrote:
> For the R bindings, we have a popular debugging mode to 'dry-run' a
> http request. By this we mean that the user builds and performs a
> http-request in the regular way, but instead of actually connecting to
> the requested host, we trick libcurl to make the http request to a
> local server, which records the full payload that libcurl has
> uploaded, and we return this blob to the user.
>
> Currently the way this is implemented is a bit cumbersome. We first
> start a http-server in the background. Then we take the handle
> provided by the user, and replace CURLOPT_URL to substitute the host
> with "http://localhost". Then we modify CURLOPT_HTTPHEADER to set the
> 'Host' request header to the host:port that was specified by the user
> in the original url, and let libcurl perform the request. The fake
> server always returns 200.
>
> Especially the part where we need to run our own http server is a bit
> annoying. I was wondering if there would perhaps be a simpler method
> trick libcurl to send a http request to a local file or buffer, from
> where we can read it. Preferably something that we can do entirely in
> C (things like nc are difficult to port).


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