ngx.capture.location method gives invalid output when output has more than 65 characters

samii89.23 · 2017-03-19T11:38:37+00:00

Hi Scott, > On Mar 18, 2017, at 12:16, Scott Cameron <rout...@gmail.com> wrote: > > I have a small Lua service which generates a unique ID f...

ngx.capture.location method gives invalid output when output has more than 65 characters

samii89.23

I'm using NGINX to call another apache/PHP service. Following is my NGINX code,


location /hello {

    content_by_lua_block {
        res = ngx.location.capture("/forward2");
        ngx.say("status: " .. res.status);
        ngx.say("result: " .. res.body);
    }
}

location /forward2{

    proxy_pass http://127.0.0.1:2002/index2.php;
}

I have a very simple php code,

<?php 

    echo "123456789";
    echo "123456789";
    echo "123456789";
    echo "123456789";
    echo "123456789";
    echo "123456789";

My problem is whever I exceed the number of output characters in php sctpt more than 65 characters I get following strange output for body


   status: 200 result: ‹30426153·°4Ò,@£)AÈ

If i have less output characters in PHP code then I get correct output as following, (in following case only three php echo lines)


status: 200 result: 0123456789012345678901234567890123456789

Do you have any idea about why this is happennning?

Note: If i access to php directly (Not via NGINX), I always get correct output for any number of characters.

cuiweixie

can you show the output of curl -v http://127.0.0.1:2002/index2.php, please?

在 2017年3月19日星期日 UTC+8上午11:38:37，සමීර කුමාරසිංහ写道：

I'm using NGINX to call another apache/PHP service. Following is my NGINX code,
location /hello {

    content_by_lua_block {
        res = ngx.location.capture("/forward2");
        ngx.say("status: " .. res.status);
        ngx.say("result: " .. res.body);
    }
}

location /forward2{

    proxy_pass http://127.0.0.1:2002/index2.php;
}
I have a very simple php code,
<?php 

    echo "123456789";
    echo "123456789";
    echo "123456789";
    echo "123456789";
    echo "123456789";
    echo "123456789";
My problem is whever I exceed the number of output characters in php sctpt more than 65 characters I get following strange output for body
   status: 200 result: ‹30426153·°4Ò,@£)AÈ  
If i have less output characters in PHP code then I get correct output as following, (in following case only three php echo lines)
status: 200 result: 0123456789012345678901234567890123456789 
Do you have any idea about why this is happennning?

Note: If i access to php directly (Not via NGINX), I always get correct output for any number of characters.

igor.clark

I've had this happen when the upstream sends gzip-encoded data. Subrequests using ngx.location.capture pass on the client headers, so if the client's sending Accept-encoding: gzip, then the upstream is probably honoring that in its response. The data you posted looks like that, a block of binary bytes.

I've worked round this by clearing the Accept-encoding header from the request before issuing the ngx.location.capture call. Alternatively, if Lua is just passing the data through without working on it, setting the content-encoding in the client response to the same as whatever the upstream sends in its content-encoding header.

cheers,
Igor

On 19/03/2017 03:38, සමීර කුමාරසිංහ wrote:

I'm using NGINX to call another apache/PHP service. Following is my NGINX code,
location /hello {

    content_by_lua_block {
        res = ngx.location.capture("/forward2");
        ngx.say("status: " .. res.status);
        ngx.say("result: " .. res.body);
    }
}

location /forward2{

    proxy_pass http://127.0.0.1:2002/index2.php;
}
I have a very simple php code,
<?php 

    echo "123456789";
    echo "123456789";
    echo "123456789";
    echo "123456789";
    echo "123456789";
    echo "123456789";
My problem is whever I exceed the number of output characters in php sctpt more than 65 characters I get following strange output for body
   status: 200 result: ‹30426153·°4Ò,@£)AÈ  
If i have less output characters in PHP code then I get correct output as following, (in following case only three php echo lines)
status: 200 result: 0123456789012345678901234567890123456789 
Do you have any idea about why this is happennning?

Note: If i access to php directly (Not via NGINX), I always get correct output for any number of characters.
.