How to solve this error "Headers are read-only, response has already started" #4416
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I used some of the code on blazor in the csla 8.2.8 source code sample to create my own blazor server program. In this program I just add a page editperson, and when it runs it always says "Headers are read-only, response has already started".I find that errors always appear when I use vm.RefreshAsync.
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Replies: 4 comments 25 replies
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Please show the edit person create method. It looks like there is an await missing on the server side part. |
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Please post it here. |
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While debugging my program, I also debugged the program in the rock source code sample, and I did a comparison. I found in my vm. ApplicationContext. ContextManager. HttpContext.Items, No cslaSessionId this item, picture on the left is my program. |
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This is almost certainly a configuration issue in |
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This doesn't feel much like a memory leak problem,The problem seems to have changed a bit, the error still appears when the page first loads, but when I try to refresh the page, the problem is gone,May be my configuration problem,What I have created is a blazor web app,not a blazor server application.When the page first loaded, the addition of the cslaSessionId raised an exception(Headers are read-only, response has already started), and when I refreshed the page, it's normal again. No exceptions are thrown,The cslaSessionId field also appears, that is so wired!!! I have been trying to find the cause of this problem, I have looked at the blazor8state demo, trying to find something helpful in it, but still can't find it |
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Iirc, the landing page needs to be server-static rendered, because it is what creates the cookie with the session id. |
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thank you for your response,I think I'm one step closer to answering this question. I'm a little new to blazor. How do I configure an already created project? |
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You shouldn't need to reconfigure the project - just the original home/landing page. Make sure it isn't rendered as an interactive page. You are using per-component render mode, so only pages you mark with the rendermode element will be interactive. |
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In the Blazor templates you can set up individual accounts with In the following test, I've moved the |
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I tried to upgrade from 8.2.7 to 8.2.8 today and immediately got the I'm using the <head>
...
<HeadOutlet @rendermode = "RenderModeForPage" />
</head>
IComponentRenderMode RenderModeForPage => HttpContext.Request.Path.StartsWithSegments("/identity")
? null
: InteractiveServer;
builder.Services.AddCsla(o => o.AddAspNetCore()
.AddServerSideBlazor(o => o.UseInMemoryApplicationContextManager = false)
.DataPortal (d => d.AddServerSideDataPortal())); |
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So, what's changed in 8.2.8? I need |
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I would say one PR with a context manager involved 😅 |
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Have you initialized the StateManager in your home page? |
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@knox007, yes, we have a |
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I upgraded to 8.28 too and had the same issue. I then changed one line and now it works.
builder.Services.AddCsla(o => o
.AddAspNetCore()
.AddServerSideBlazor());
My application is a blazor server application with an interactive landing page too. I did not add or subtract any other line.
Have a nice day.
Kevin
…________________________________
From: Stefan Ossendorf ***@***.***>
Sent: Wednesday, February 5, 2025 3:13 AM
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Subject: Re: [MarimerLLC/csla] How to solve this error "Headers are read-only, response has already started" (Discussion #4416)
I would say one PR with a context manager involved 😅
https://github.com/MarimerLLC/csla/releases/tag/v8.2.8
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@knox007, so you haven't solved this yet, either: |
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I have replicated the issue, which is now a bug #4469 |
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The fix is now in the v8.x branch and soon main (for v9). Please note that the landing page does not need to be server-static - a server-interactive page is fine, as long as the state manager gets initialized in the page's |
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Sorry for the late reply. I've been a little busy lately, really learned, Thank you very much Rock |
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The fix is now in the v8.x branch and soon main (for v9).
Please note that the landing page does not need to be server-static - a server-interactive page is fine, as long as the state manager gets initialized in the page's
OnInitializeAsyncmethod.