Dealing with Array of Base64 strings in Web Api

Question

i'm trying to maintain a project which is trying to post images (yes multiple) from mobile devices to a dot-net web api.

The default content between api and mobile devices is application/json.

public async Task<HttpResponseMessage> PostExpertiseForm(List<string> images){}

This is the actual method for posting and in this method they are trying to write base64 strings (images) to files.

But the problem is when i tried to call this api, for the first time web api binds images with my base64 strings, but all next requests (same request with the first one) are binds to null.

I did some google search and tought about it was a request size problem and i added this lines to Web.config :

<httpRuntime targetFramework="4.6" maxRequestLength="2147483647" />

<requestLimits maxAllowedContentLength="2147483648" />

<jsonSerialization maxJsonLength="2147483644">

Didnt work.

What is the real problem here? Why my first request worked?

Thanks for your advice!

Answer 1

The problem was not about json size. There was a mechanism for logging every response and request, in log request method i saw this line var request=await Request.ReadAsStringAsync();

After little searching about parameterless post methods in web api i found that question why-is-the-body-of-web-api-request-read-once

And i realised that i was try to read the request body twice and caused dead lock.

I changed the logic of logging. The problem has gone.