Transform or middleware for modifying response bodies #2389
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I'm looking to modify a JSON response body before proxying it back to our client and first did this in a middleware. However after reading you documentation about what not to do in middleware it seems response modification is not advised in middleware. https://microsoft.github.io/reverse-proxy/articles/middleware.html#what-not-to-do-with-middleware I then read your section on response body transforms where response modification didn't seem to be discouraged as much https://microsoft.github.io/reverse-proxy/articles/transforms.html#request-body-transforms My question therefore is whether there it would be better to use middleware or a request body transform for this sort of modification?Or is there not really a difference? |
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Transforms are a little better because the content has to be copied from the HttpResponseMessage to the HttpResponse anyways, so inserting yourself in there isn't adding an extra step. If you can do the transformation in a streaming fashion (processing a bit at a time rather than reading the whole thing into memory) that's even better. |
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I'm struggling to find sample code on how to implement this. Is there an existing example on the best way to implement this? |
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Transforms are a little better because the content has to be copied from the HttpResponseMessage to the HttpResponse anyways, so inserting yourself in there isn't adding an extra step. If you can do the transformation in a streaming fashion (processing a bit at a time rather than reading the whole thing into memory) that's even better.