•  09-12-2019
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Question

httpd.conf file config for brew is this:

<Directory /usr/local/apache2/htdocs/brew>
        SetHandler r-script
        RHandler brew::brew
        DefaultType text/html
</Directory>

under the brew folder, I have this file:

<html>
<body>
<%
library(Cairo)
filename <- paste(tempfile(tmpdir='/usr/local/apache2/htdocs'), '.png', sep='')
CairoPNG(filename)
x<-1:10000
plot(x, type="l", col="red")
dev.off()
%>
<img src="<%=filename%>"/>
</body>
</html>

I set all the permission 777 to be on the safe side, at least until I get it working.

When I call http://localhost/brew/temp.brew, I see the file is being generate under htdocs folder but the browser is not displaying the image, get a broken image. What am I missing? Thanks again for all the help from this group.

When I try to brew something simple like this, I get the print out on the browser:

<%
x<-1:1000
print(x)
%>

This may be an apache related. When I do this:

 <%=filename%>

I get this on the browser:

/usr/local/apache2/htdocs/file199c5ea9644c.png

My apache home directory is /usr/local/apache2/htdocs, but when the full path is provided in img src="<%=filename%>" it sees it as /usr/local/apache2/htdocs/filename.png, apache dont know what this is. Any ideas?

Was it helpful?

Solution

The local file name, with its full, is only known to the server (apache): for the client (your web browser), you need a URL or a relative path. In particular, the /usr/local/apache2/htdocs prefix should no longer be there.

Try replacing 

<img src="<%=filename%>"/>

with 

<img src="<%=gsub('/usr/local/apache2/htdocs', '', filename)%>"/>

OTHER TIPS

You need to install RApache: http://rapache.net/

RApache is an Apache module with R that interpret your brew code on the server and renders a proper html page.

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