C#•2y ago

❔ ✅ Swagger page doesn't load in fresh generated 7.0 .net webapi

The API itself works, I can create, query, and access new endpoints in the browser. But the swagger UI either isn't hosted or generated at all (404 not found) My only hint is this warning when I try to load the page: Microsoft.AspNetCore.HttpsPolicy.HttpsRedirectionMiddleware[3] Failed to determine the https port for redirect ...Which disappears when I comment out app.UseHttpsRedirection(); in Program.cs. Anyone come across this before? Maybe someone could share their config or program.cs?

35 Replies

V0FBU1VM•2y ago

The application doesn't seem to be freshly generated. There have been some modifications. Try this

       app.UseSwagger();

       app.UseSwaggerUI();

       app.UseSwagger();

       app.UseSwaggerUI();

and navigate to localhost:port/swagger when running.

PjotrHOP•2y ago

Yes, c.SwaggerEndpoint("/swagger/v1/swagger.json", "My API V1"); on line 22 was added in an attempt at troubleshooting. Removed it again, same result on http://localhost:5132/swagger

PjotrHOP•2y ago

PjotrHOP•2y ago

here's my launchsettings for good measure

Pobiega•2y ago

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();

this is the program.cs for a freshly generated web api if you remove your alterations to SwaggerGen and SwaggerEndpoint, does that help?

PjotrHOP•2y ago

Nope, same result. Note that I've already tried the fresh version, my alterations have been done to troubleshoot.

Pobiega•2y ago

very weird, since the fresh template works

PjotrHOP•2y ago

I can try to generate another new project

Pobiega•2y ago

yeah just dotnet new webapi -n DeleteMe and run it straight up, not a single line of code modified

PjotrHOP•2y ago

will do

Pobiega•2y ago

if that doesnt work, something is very weird

PjotrHOP•2y ago

DeleteMe? what's this

Pobiega•2y ago

just the name of the new project 🙂

PjotrHOP•2y ago

oh lol

Pobiega•2y ago

-n gives it a name via the CLI and creates it in a new subfolder instead of generating the project where you are

PjotrHOP•2y ago

still the same Microsoft.AspNetCore.HttpsPolicy.HttpsRedirectionMiddleware[3] Failed to determine the https port for redirect. warning when trying to access root url and http://localhost:5113/swagger

Pobiega•2y ago

well, you shouldn't be accessing it on HTTP how are you running it?

PjotrHOP•2y ago

dotnet run

PjotrHOP•2y ago

it defaults to http apparently

PjotrHOP•2y ago

Pobiega•2y ago

okay. you can make it use https by default by re-ordering the profiles - or use dotnet run --launch-profile https

PjotrHOP•2y ago

this is with https in url that worked but still the same 404 in browser

Pobiega•2y ago

https uses a different port make sure you are accessing the correct url

Pobiega•2y ago

PjotrHOP•2y ago

yes it's on https://localhost:7289

PjotrHOP•2y ago

PjotrHOP•2y ago

Pobiega•2y ago

Don't take this the wrong way, but you must be doing something wrong :p are you sure you dont have another instance of the program running already, causing binding failures? or another app using those ports

PjotrHOP•2y ago

Not that I know of. Gonna make sure brb rebooting Nah still nothing only thing I can think of now is that I had to manually set my environment variable for the 7.0 SDK to generate a project setting it to C:\Program Files\dotnet\sdk\7.0.203\Sdks after installing 7.0 sdk but I can generate the project so clearly that works Noticing something else in my env variables: %USERPROFILE%.dotnet\tools --- C:\Users\peter.dotnet doesn't have any tools folder idk if that's relevant

Pobiega•2y ago

probably not for this tools is like a "plugin" for the dotnet cli

PjotrHOP•2y ago

gotcha

Pobiega•2y ago

Can you jump into #dev-vc-1 and share screen btw?

PjotrHOP•2y ago

sure

Pobiega•2y ago

Solved - DOTNET_ENVIRONMENT was set to an unexpected value which caused app.Environment.IsDevelopment() to say false

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ ✅ Swagger page doesn't load in fresh generated 7.0 .net webapi