Re: Garbage in HTTP response

[Justin Taylor <JUSTIN@xxxxxxxxxxxxx>]

Good question.  I'm hard-coding the content-type in my RPG code.  I assume that's related to the unprintable characters at the beginning of my payload.  I guess those characters may be the image the content-type is referring to.  I have no idea where either are coming from.

Thanks



-----Original Message-----
From: B Stone [mailto:bvstone@xxxxxxxxx] 
Sent: Friday, May 24, 2019 11:19 AM
To: Web Enabling the IBM i (AS/400 and iSeries) <web400@xxxxxxxxxxxxxxxxxx>
Subject: Re: [WEB400] Garbage in HTTP response

Why is it using this:

Content-Type: image/x-portable-graymap


Bradley V. Stone
www.bvstools.com
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On Fri, May 24, 2019 at 10:43 AM Justin Taylor <JUSTIN@xxxxxxxxxxxxx> wrote:

> I have a CGI webservice written in RPG that returns JSON.  It 
> processes about 200 requests a day and has been in production for a couple of weeks.
> I have one request that consistently returns strange garbage at the 
> beginning of the response.  So far, I’ve only seen a single request 
> that does this.  I can’t see anything unusual about this request.  
> I’ve debugged the RPG code, and it looks to be functioning correctly.
>
> Any suggestions on where to look now?  TIA
>
>
> Here is what a normal response looks like:
> HTTP/1.1 200 OK
> Date: Fri, 24 May 2019 15:05:38 GMT
> Server: Apache
> Content-Type: application/json; charset=utf-8
> Content-Length: 80297
>
> {json_data_here}
>
>
>
> Here is what the bogus response consistently shows:
> HTTP/1.1 200 OK
> Date: Fri, 24 May 2019 15:27:05 GMT
> Server: Apache
> Content-Type: image/x-portable-graymap
> Content-Length: 91261
>
>
>  `鉗@ K  @@Ö       @M ]@    `    @ɇ  @ׁ    @@    `  `  %     @兙    @ K 
>  @M      ~  m  k䣆  ~  kȤ  Ɖ   ~  k @   ]%%י        @       z@a
>    a   `            `    `     m      m                    K   %%ŧ    
>     @@     K   %ŧ        @@     K   %ŧ        @@    K   %ŧ        @@  
>     K   %ŧ        @@ ä   K   %%ť        @  @֒%%Ɖ   z@
>  %≩ z@@@@@@@     %Ö        z@    %⣁   z@   @  
> %Ö     `    z@           a    ^@       ~   ` 
> %
> %{json_data_here}
>
>
>
> RPG snippet:
>        yajl_genOpen(*off);
>        yajl_beginObj();
>        yajl_addChar('' : );
>        yajl_addCharPtr('' : :);
>
>        yajl_endObj();
>
>        yajl_copyBuf( 1208
>                    : %addr(lJsonData)
>                    : %size(lJsonData)
>                    : lLength );
>
>        yajl_genClose();
>
>        lDataOut = 'Status: 200 OK'
>                 + CRLF
>                 + 'Content-type: application/json; charset=utf-8'
>                 + CRLF + CRLF
>                 + lJsonData
>                 + CRLF
>                 ;
>        lLength = %len(%trimr(lDataOut));
>
>        QtmhWrStoutAPI(lDataOut :lLength :QUSEC);
>        If QUSEI = *blank;
>        Else;
>        Endif;
> --
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