October 14, 2024 08:04 by
PeterWe'll attempt to use custom middleware to alter HttpResponse in this post. After developing custom middleware, we will alter the response. The middleware will alter the HttpResponse each time the request is returned to the client.
public class CustomResponseMiddleWare
{
private readonly RequestDelegate _next;
public CustomResponseMiddleWare(RequestDelegate next)
{
_next = next;
}
public async Task InvokeAsync(HttpContext context)
{
context.Response.Headers["CustomHeader"] = "This middleware added by Peter";
await _next(context);
}
}
We have created custom middleware and added a new header at the invoke method.
Program.cs
using SampleHttpResponseModify;
var builder = WebApplication.CreateBuilder(args);
// Add services to the container
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
var app = builder.Build();
// Use custom middleware
app.UseMiddleware<CustomResponseMiddleWare>();
// Configure the HTTP request pipeline
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}
app.UseHttpsRedirection();
app.UseAuthorization();
app.MapControllers();
app.Run();
Register middleware at the program. cs.
app.UseMiddleware<CustomResponseMiddleWare>();
When we ran the application and inspected it, we found a custom-added header in the response.Now let us try to modify the Http header when a particular API is called.
Consider i want to add an extra header when we call weather API only then do we have to add condition on middleware like below.
public class CustomResponseMiddleWare
{
private readonly RequestDelegate _next;
public CustomResponseMiddleWare(RequestDelegate next)
{
_next = next;
}
public async Task InvokeAsync(HttpContext context)
{
context.Response.Headers["CustomHeader"] = "This middleware added by Peter";
if (context.Request.Path.Value == "/WeatherForecast")
{
context.Response.Headers["CustomeHeadernparticularRequest"] = "This is header added when this path found";
}
await _next(context);
}
}
We have added the below condition only, so if the below path is found then only add an extra header.
if (context.Request.Path.Value == "/WeatherForecast")
{
context.Response.Headers["CustomeHeadernparticularRequest"] = "This is header added when this path found";
}
Response on WeatherForcast API. We can see the additional header is coming.
Another learning point here is a sequence of middleware in the program.cs. If we move the position of UseMiddleware then we will find that this middleware is not calling due to incorrect positions or order of middleware.
Conclusion
We have learned about how to modify http headers using custom middleware. Keep learning and Keep Enjoying.
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