C#•2y ago•

22 replies

API request, working in Postman but not C#

I'm trying to call a certain API and then get a response back. When I run the code in Postman it works fine, I get the right response. But when I run it in C#, I get 403 forbidden. If I run the code in Postman without the JSON body, then I get 400 bad request. So I know it's not the JSON that's the issue, meaning it's probably the headers. Could someone give me a hint at what I should look at to solve this problem?

string jsonString = "{\"purpose\":\"MAX\",\"applicants\":[{\"birthYear\":2003,\"qualifiesEmploymentLength\":true,\"monthlyIncome\":55000,\"employmentType\":\"PERMANENT\",\"employmentRole\":\"\",\"maritalStatus\":\"SINGLE\"}],\"existingProperties\":[],\"household\":{\"children\":[],\"amortizationStudentDebt\":729,\"otherAssets\":0,\"carCost\":[{\"type\":\"OWNED\"}]},\"intermediaryType\":\"454\",\"newProperty\":{\"propertyType\":\"HOUSE\",\"mortgage\":null,\"downPayment\":700000,\"municipality\":\"Örebro\",\"livingSpace\":130}}";

var client = new HttpClient();
client.BaseAddress = new Uri("https://api.sbab.se/api/pre-approval/2.0/");

var content = new StringContent(jsonString, Encoding.UTF8, "application/json");

var response = client.PostAsync("loan-offer", content).Result;


Console.WriteLine(jsonString);

string jsonString = "{\"purpose\":\"MAX\",\"applicants\":[{\"birthYear\":2003,\"qualifiesEmploymentLength\":true,\"monthlyIncome\":55000,\"employmentType\":\"PERMANENT\",\"employmentRole\":\"\",\"maritalStatus\":\"SINGLE\"}],\"existingProperties\":[],\"household\":{\"children\":[],\"amortizationStudentDebt\":729,\"otherAssets\":0,\"carCost\":[{\"type\":\"OWNED\"}]},\"intermediaryType\":\"454\",\"newProperty\":{\"propertyType\":\"HOUSE\",\"mortgage\":null,\"downPayment\":700000,\"municipality\":\"Örebro\",\"livingSpace\":130}}";

var client = new HttpClient();
client.BaseAddress = new Uri("https://api.sbab.se/api/pre-approval/2.0/");

var content = new StringContent(jsonString, Encoding.UTF8, "application/json");

var response = client.PostAsync("loan-offer", content).Result;


Console.WriteLine(jsonString);

string jsonString = "{\"purpose\":\"MAX\",\"applicants\":[{\"birthYear\":2003,\"qualifiesEmploymentLength\":true,\"monthlyIncome\":55000,\"employmentType\":\"PERMANENT\",\"employmentRole\":\"\",\"maritalStatus\":\"SINGLE\"}],\"existingProperties\":[],\"household\":{\"children\":[],\"amortizationStudentDebt\":729,\"otherAssets\":0,\"carCost\":[{\"type\":\"OWNED\"}]},\"intermediaryType\":\"454\",\"newProperty\":{\"propertyType\":\"HOUSE\",\"mortgage\":null,\"downPayment\":700000,\"municipality\":\"Örebro\",\"livingSpace\":130}}";

var client = new HttpClient();
client.BaseAddress = new Uri("https://api.sbab.se/api/pre-approval/2.0/");

var content = new StringContent(jsonString, Encoding.UTF8, "application/json");

var response = client.PostAsync("loan-offer", content).Result;


Console.WriteLine(jsonString);

string jsonString = "{\"purpose\":\"MAX\",\"applicants\":[{\"birthYear\":2003,\"qualifiesEmploymentLength\":true,\"monthlyIncome\":55000,\"employmentType\":\"PERMANENT\",\"employmentRole\":\"\",\"maritalStatus\":\"SINGLE\"}],\"existingProperties\":[],\"household\":{\"children\":[],\"amortizationStudentDebt\":729,\"otherAssets\":0,\"carCost\":[{\"type\":\"OWNED\"}]},\"intermediaryType\":\"454\",\"newProperty\":{\"propertyType\":\"HOUSE\",\"mortgage\":null,\"downPayment\":700000,\"municipality\":\"Örebro\",\"livingSpace\":130}}";

var client = new HttpClient();
client.BaseAddress = new Uri("https://api.sbab.se/api/pre-approval/2.0/");

var content = new StringContent(jsonString, Encoding.UTF8, "application/json");

var response = client.PostAsync("loan-offer", content).Result;


Console.WriteLine(jsonString);

IIsaaaak I'm trying to call a certain API and then get a response back. When I run the co...

Jimmacle•2/1/24, 6:39 PM

403 suggests an authentication issue

Jimmacle•2/1/24, 6:39 PM

are you using the same credentials for both requests?

JJimmacle are you using the same credentials for both requests?

IsaaaakOP•2/1/24, 6:39 PM

there are no credentials/no auth it's not required)

IsaaaakOP•2/1/24, 6:40 PM

TeBeCo•2/1/24, 6:40 PM

I would start making an actual DTO

TeBeCo•2/1/24, 6:41 PM

and use PostFromJsonAsync<T>(dto)

TeBeCo•2/1/24, 6:41 PM

instead of a string like this + stringcontent

TeBeCo•2/1/24, 6:41 PM

and properly await

TeBeCo•2/1/24, 6:41 PM

and probably not use base address until it works

TeBeCo•2/1/24, 6:41 PM

once you have the "normal C#" working start tweaking

TeBeCo•2/1/24, 6:42 PM

but the code you have right now is full of thing that makes it impossible to follow on

TTeBeCo I would start making an actual DTO

IsaaaakOP•2/1/24, 6:45 PM

I do think I have that, I'm not really familiar with the concept however. I just removed this serialization for debugging purposes and put the actual JSON instead

TeBeCo•2/1/24, 6:45 PM

make it one

IsaaaakOP•2/1/24, 6:46 PM

Basically followed this tutorial https://tutorials.eu/how-to-call-post-api-in-csharp/

TutorialsEUJafar Jabbarzadeh

How to call POST API in C# | TutorialsEU

In this article, we will create a simple project demonstrating how to call Post API in C# and how to serialize and deserialize C# objects to and from JSON.

TTeBeCo and use PostFromJsonAsync<T>(dto)

IsaaaakOP•2/1/24, 6:47 PM

but then I have to deal with tasks and stuff :(

TeBeCo•2/1/24, 6:47 PM

yeah

IsaaaakOP•2/1/24, 6:47 PM

anyways

IsaaaakOP•2/1/24, 6:48 PM

if we disregard this

IsaaaakOP•2/1/24, 6:48 PM

because I'm pretty sure the JSON is not the problem

IsaaaakOP•2/1/24, 6:48 PM

the problem is the headers I think

IsaaaakOP•2/1/24, 8:58 PM

Any1 got any idea?

Jimmacle•2/1/24, 9:02 PM

start by making your postman and C# requests match exactly, then remove things until you find what triggers the issue

API request, working in Postman but not C#

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