204 Net

204 Net. NetMan 204 is a network communications card that enables Riello UPS systems to easily integrate into medium or large networks ensuring secure and reliable communication between the UPS and its management software Designed to integrate UPS systems over 10/100 Mbps ethernet connections and IPv4/6 networks using Modbus/TCP BACnet/IP and SNMP.

HTTP Status 204 (No Content) indicates that the server has successfully fulfilled the request and that there is no content to send in the response payload body Server might want to return updated meta information in the form of entityheaders which if present SHOULD be applied to current document’s active view if any.

HTTP Status 204 (No Content) REST API Tutorial

Our salary calculator indicates that on a £204 salary (gross income of £204 per year) you receive take home pay of £204 (a net wage of £204) The total tax you owe as an employee to HMRC is £0 per our tax calculator Your employer collects this through PAYE and pays it over to HMRC on your behalf.

Null API Responses and HTTP 204 Results in ASP.NET Core

Why So Angry?What Does This Look like?Working Around The Default Null to Http 204 ConversionOther Solutions Using A Result Message TypeSummaryThe reason this is a problem is because some frameworks that use HTTP clients look for specific HTTP result codes or expect a specific content type result for a &#39data request&#39 Specifically Angular&#39s HttpClient expects a 200 response or an application/json content type for successful requests Fire back a 204 and it turns the response into an error resultwhich is a pain in the ass to work with at that point That&#39s not helpful To give you a better idea what I&#39m talking about here is a simple controller that demonstrates 3 different results using the default behaviors 1 A full object response (JSON) 2 A null response (204) 3 And an explicit NoContent Action (204) Here&#39s the simple controller The first response from this request as you would expect returns a JSON object The result contenttype is application/jsonand the output is a JSON string of the object&#39s result The second request returns nullfrom the controller action but returns a HTTP 204 response As you can see the result is HTTP 204 and there&#39s no application/jsoncontent type set for the Response It&#39s a pure No Content result Finally the last request is just for reference to demonstrate how to explicitly return a no content result It also returns an HTTP 204 response which mirrors the previous request&#39s HTTP 204output My point in showing this last request is that if you intend to return a no content result it&#39s not exactly difficult So to fix the auto 204 conversion there&#39s an easy workaround You can remove the HttpNoContentOutputFormatter in Startupcs and your ConfigureServices()method Et voila! Now when you rerun the null result request it no longer produces a HTTP 204 response but rather creates the full JSON nullresult Problem solved This cat can also be skinned a different way by returning richer result values that guarantee that an object is return for any valid result Rather than returning nullor any simple type values like strings you can use a result message object that includes some status properties to indicate success and failure or a no data status It always returns an object even if the actual result data might be null This pushes the check for no data or null to the client rather than the framework intercepting the HTTP call and guarantees that there&#39s always a value returned and nonvalue results only occur when an actual error occurs This also solves the problem in the aforementioned Angular example A typical result type might look like this Rather than returning null perhaps you set IsError = true or NoData = true to indicate the actual result state to the client But you can still set ResultValue = nullif that means anything to your client application While this works it does add some o Yeah I can bitch and moan about the choices the ASPNET Core team is making for &#39fixed up&#39 API results but at least there are always work arounds available to make this work as your application requires The solution for the null result is simple by removing the HttpNoConteOutputFormatter in the configuration For the string issue there&#39s more work required unfortunately and for that you can check my older blog post on Accepting and Returning Raw Content Hopefully this post will help a few of you to resolve HTTP 204 issue if it crops up for you more quickly than I did.

NetMan 204 Riello UPS

The HTTP 204 No Content success status response code indicates that a request has succeeded but that the client doesn&#39t need to navigate away from its current page This might be used for example when implementing “save and continue editing” functionality for a wiki site In this case a PUT request would be used to save the page and the 204.