[FIXED] How to corectly set the ContentType property in HttpWebRequest (or how to fix the missing Content-Type header)

Issue

I thought I'd share something that took me some time to figure out:

I wrote a simple Post method using HttpWebRequest class. In HttpWebRequest you can't use HttpWebRequest.Headers collection to set your desired headers when there is a dedicated property for it - you must use that dedicated property. ContentType is one of them. So I created my HttpWebRequest like this:

            HttpWebRequest httpWebRequest = (HttpWebRequest)webRequest;
            httpWebRequest.Method = "POST";
            httpWebRequest.KeepAlive = false;
            httpWebRequest.ServicePoint.Expect100Continue = false;
            httpWebRequest.ContentType = "application/json";

somewhere below I set the body of my request like this:

            using (StreamWriter streamWriter = new StreamWriter(streamWebRequest))
            {
                streamWriter.Write(sJson);
            }

and posted the request using:

            WebResponse webResponse = httpWebRequest.GetResponse();

But I kept getting a "400 - Bad Request" error, while the same request worked from Postman. After analyzing the request with Fiddler I found that when I send the request from my app, the Content-Type: application/json header is missing. All the other headers were present, except for Content-Type. I thought I'm setting it wrong, so I googled but didn't find a good answer. After much experimentation I found, that if I move the line:

            httpWebRequest.ContentType = "application/json"

after this block:

            using (StreamWriter streamWriter = new StreamWriter(streamWebRequest))
            {
                streamWriter.Write(sJson);
            }

then the httpWebRequest.ContentType = "application/json" header finally appears in the request. So, for HttpWebRequest make sure you always set your HttpWebRequest's body/content first, before you set the ContentType property.

Hope it helps

Solution

My question above already has the answer, but to mark it as "Answered" I had to add this comment:

Make sure you always set your HttpWebRequest's body/content first, before you set the ContentType property.This way the "Content-Type" header will appear in the request.

Answered By - Alexey Nagoga

Answer Checked By - Terry (PHPFixing Volunteer)

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[FIXED] How to change content-type but keep charset on Apache2?

Issue

I have a Apache2 server on Ubuntu for proxy server. I want to change content-type of response to client to another but it will remove charset too.

# /etc/apache2/sites-available/000-default.conf
Header set Content-Type "text/html" "expr=%{resp:Content-Type} =~ m|text/abcdefgh|"  

With this setting, when it see the header which content-type is text/abcdefgh or text/abcdefgh; charset=utf-8 or text/abcdefgh; charset=shift_jis, it will become text/html without charset

1. Is there any way to change part of content-type by Header set or others?
2. Where can I find the meaning of this pattern?

Many thanks!

Solution

Did you try to use edit instead of set?

Header edit Content-Type "text/abcdefgh" "text/html"

It should just replace text/abcdefgh with text/html but leave the charset as is

Answered By - Capsule

Answer Checked By - Willingham (PHPFixing Volunteer)

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