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  • Content Length and Transfer Encoding Chunked nginx, node-http-proxy

    - by rampr
    I have the following setup - node-http-proxy acts as a reverse proxy forwarding all requests to nginx/socket.io as necessary My problem is this When I send a HTTP DELETE request from the browser, node-http-proxy adds a header "Transfer Encoding Chunked" as the request from the browser had no Content Length. The request from the browser had no Content Length as it had no body. Nginx doesn't like the Transfer Encoding Chunked Header and throws a 411 asking for Content-Length. The problem gets solved when I send dummy data as part of the DELETE request so there is a Content Length and node-http-proxy doesn't add Transfer Encoding Chunked header and nginx is happy. I want to understand if node-http-proxy isn't working as expected, because it adds a Transfer Encoding Chunked header when Content Length is missing because there is no Content Body.

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  • How can I boost the volume of my Video

    - by Sunny Shah.
    I have a video that I need to pass on to some of my friends but it has very low audio volume. How can I boost the audio volume in this video so that it has a similar level as my other videos? Is there a video converter that can boost the audio volume?

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  • X11 for apache user

    - by fuenfundachtzig
    We are using inkscape to convert SVG images uploaded to our server via a web form. For this inkscape offers a batch mode via the -z option, but this batch mode has a flaw: When inkscape is run by the apache user, it breaks saying $ inkscape -z -W drawing.svg X11 connection rejected because of wrong authentication. The application 'inkscape' lost its connection to the display localhost:11.0; most likely the X server was shut down or you killed/destroyed the application. If you do the same as a normal user you also get errors: Xlib: connection to "localhost:11.0" refused by server Xlib: PuTTY X11 proxy: MIT-MAGIC-COOKIE-1 data did not match (inkscape:24050): Gdk-CRITICAL **: gdk_display_list_devices: assertion `GDK_IS_DISPLAY (display)' failed 301.27942 But at least inkscape gives the correct answer (here the number stating the width of the image). Does somebody know how to make this also work for the apache user? Does it make sense to authorize apache to use X (if so how)? In any case it doesn't feel like the right solution...

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  • gcc sandboxing tool - AppArmor / CHROOT jail on Ubuntu 12.04

    - by StuR
    We have a Node application as the front end to a C++ sandboxing tool, which compiles code using gcc and outputs the result to the browser. e.g. exec("gcc -o /tmp/test /tmp/test.cpp", function (error, stdout, stderr) { if(!stderr) { execFile('/tmp/test', function(error, stdout, stderr) {}); } }); This works fine. However, as you can imagine this is a security nightmare if it were to be made public - so I was thinking of two options to protect my stack: 1) A CHROOT jail - but this in itself wouldn't be enough to prevent directory traversal / file access. 2) AppArmor ? So my question is really, how could I protect my stack from any nasties that could come from: A) Compiling unknown code using gcc B) Executing the compiled code

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  • netcat as a multithread server

    - by etuardu
    Hello, I use netcat to run a simple server like this: while true; do nc -l -p 2468 -e ./my_exe; done This way, anyone is able to connect to my host on port 2468 and talk with "my_exe". Unfortunately, if someone else wants to connect during an open session, it would get a "Connection refused" error, because netcat is no longer in listening until the next "while" loop. Is there a way to make netcat behave like a multithread server, i.e. always in listening for incoming connections? If not, are there some workarounds for this? Thank you all!

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  • Automatic Excel Script

    - by Thomas
    I am a 6th year medical student and I'm working on my thesis. I have no experience with programming whatsoever, a friend recommended me to post my question here. I am strugling with the following problem: I have data of 400 patients, stored in 400 different excel files. Each file contains 34 columns in a specific order, let's say A to Z. The order is the same in each of these 400 files. Now I need to a make a new excel document that contains the first column of each patient. So I need all the first columns of my 400 different excel files, lined up next to each other in a new document. Preferebally in the form of a automatic script. After that I want to do the exact same thing but for the second column, then the third and so on. This is probably a problem that has already been solved. Otherwise could someone help me out? You have my thanks!

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  • How can I batch convert SVG files containing text to PDF files (specifically on CentOS 5.3 x86_64)?

    - by molecules
    I would like to programatically convert SVG files to PDF files. However, the SVG files contain text that must be searchable in the generated PDF files. Also, it has to work on Red Hat Enterprise Linux 5.3 or CentOS 5.3 for the x86_64 architecture. It would be nice if it were Open Source or at least not very expensive. Here is what I've tried. All of these, except Batik, work fine on Debian Lenny. Inkscape I can get it installed using autopackages from http://inkscape.modevia.com/ap, but when I use it from the command line, the text is not searchable. Batik rasterizer [sic] When it converts SVG files to PDF files, the text is no longer searchable. svg2pdf The source for this and several of its dependencies are available to download. I have been trying to get it to compile on CentOS, but haven't had success yet. I found a precompiled version for Debian x86_64, but it doesn't work on CentOS. rsvg-convert Generated PDF isn't searchable on CentOS 5.3. Perhaps installing a newer version of cairo would help. Thanks to DaveParillo for mentioning rsvg-convert (on superuser). SOLUTION (but perhaps some of the above will still be useful to the reader) princeXML It works fine on CentOS when installed from source. For some reason it doesn't work when installed from the .rpm. Thanks Erik Dahlström! (provided solution that worked for my case on stackoverflow) Cross posted on stackoverflow

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  • Optimum number of threads while multitasking

    - by Gun Deniz
    I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software called Gaussian that can take advantage of multithreading. So I set its thread count to 8 for a single calculation for maximum speed. However I really can't decide what to do when I need to do run for instance 8 calculations simultaneously. In that case should I set the thread count to 1(total 8 threads spawned in 8 processes) or keep it 8(total 64 threads spawned in 8 processes) for each job? Does it really matter much? A related question is does the OS automatically does the core-parking to diffrent cores for each thread?

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  • Capture documents in bitonal, or grayscale then downsample

    - by Jason R. Coombs
    I'm about to embark on a document archival process. I'm going to spend a lot of good money to archive some paper (actually microfiche) to TIFF images. I have a choice of 300-dpi bitonal (2-bit, black/white) or 300-dpi grayscale (8-bit). Cost is the same for either format. Data volume (and thus image size) is not a factor. It seems to me that the grayscale, since scanned at the same resolution as the bitonal, would always contain more information and could always be downsampled to the equivalent bitonal image. Are there any downsides to selecting grayscale, and then later downsampling to bitonal if desired? In other words, is it possible that the scanning software will perform a more accurate (or more legible) representation than a grayscale image converted to bitonal?

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  • image filter that spits out pi

    - by patrickinmpls
    I've seen this before but I forgot what's its called. Does anyone know of software that takes a picture and spits out an image of the number pi, ie. 3.14... not the symbol? It basically kinda looks like ascii art but the numbers are different shades of gray so it is like a black and white photo. Thanks!

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  • Elastic beanstalk access private git repo

    - by user221676
    I am trying to currently add an ssh key to my elastic beanstalk instances using .ebextensions commands. The keys I have stored are in my application code and I try to copy them to the root .ssh folder so I can access them when doing a git+ssh clone later here is an example of the config file in my .ebextensions folder packages: yum: git: [] container_commands: 01-move-ssh-keys: command: "cp .ssh/* ~root/.ssh/; chmod 400 ~root/.ssh/tca_read_rsa; chmod 400 ~root/.ssh/tca_read_rsa.pub; chmod 644 ~root/.ssh/known_hosts;" 02-add-ssh-keys: command: "ssh-add ~root/.ssh/tca_read_rsa" the problem is that I get is an error when attempting to clone the repo Host key verification failed. I have tried many ways of try to add the host to the known_hosts file but none have worked! The command that is doing the clone is npm install as the repo points to a node module

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  • TIF opens via IE, but not within a page

    - by tsilb
    I have a picture: http://www.kconnolly.net/Gallery/Panoramas/Mountainscapes/DSCN2049_stitch_sm.tif Which loads fine when I paste it into my address bar. However, when I embed it within a Page, I get a broken image icon. However, all browsers treat it as a download. Conversely, this image, which was made the same way, works fine when I embed it within a Page. Browsers treat this as a Document and not as a Download: http://www.kconnolly.net/Gallery/Panoramas/Mountainscapes/DSCN2060_stitch_sm.tif Why is that?

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  • Having Troubles Getting My Apache Server Online(NodeJS and Apache)

    - by Jeff Armingol
    I am new here. This is my situation. I am using nodejs modules, serialport2 and socket.io, because I am trying to forward the data from my arduino hardware through serialports. In my server side script, I read the data then forward it to the client side. Now I am using Apache to serve the html page,which is the client side. I am running Nodejs on port 8000 and Apache on port 80. It is running OKAY when I view it in my browser typing localhost:80. The data is appearing and seems fine. Now when I tried to get my Apache server online using a Free DDNS provider(http://www.noip.com/) and my port80, it loaded the webpage but there are no data appearing on the page. What seems to be the problem here? Really need your expertise and advice. Thanks in advanced!

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  • Gifsicle: How to set it to not overwrite the original GIF file if the resulting modified GIF file is larger than the original?

    - by galacticninja
    About Gifsicle: Gifsicle is a command-line tool for creating, editing, and getting information about GIF images and animations. One of its features is (from its website): Optimize your animations! This stores only the changed portion of each frame, and can radically shrink your GIFs. You can also use transparency to make them even smaller. Gifsicle’s optimizer is pretty powerful, and usually reduces animations to within a couple bytes of the best commercial optimizers. I call Gifsicle through this .BAT file in the Right Click - 'Send to' Menu: @echo off :compressFile "C:\Programs\Compression Scripts\gifsicle\bin\gifsicle.exe" --batch -V -O3 %1% echo. echo. SHIFT if exist %1% goto compressFile PAUSE This animated GIF file, however: http://i.minus.com/i7WdodY5Zwot3.gif, when its compression is optimized with Gifsicle with the above commands, results in a larger-filesized GIF file. Gifsicle overwrites the original GIF file with the resulting larger-filesized GIF file. Initial filesize: 7.57 MiB (7,942,886 bytes). After running through the above commands with Gifsicle: 7.64 MiB (8,017,622 bytes). Is there a way to prevent Gifsicle from overwriting the original file if its output file is larger than the original file, while still overwriting the original file if the output file is smaller? Details: OS: Windows 7 Gifsicle version: 1.63, from the binary provided here: http://www.lcdf.org/gifsicle/ Gifsicle manual

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  • nodejs server hanging from time to time

    - by Johann Philipp Strathausen
    I have a node server (0.6.6) running an Express application, along with Mongoose and s3, on an Ubuntu 11.04 machine. Several times per hour, the server is hanging. That means that the application is working fine, I see the express loggings, and then all of a sudden the server stops responding. No errors, no traces, no loggings, and strangely enough the browser won't show the request even in the network debugging window. From any machine in the local network it's the same behaviour. I restart the server and it's okay again for several minutes, then again starts to hang, everytime while doing something different. The same application on Amazon on the same Ubuntu version works fine and never hangs. I know all this is kind of vague, but I don't know where to start. Has any of you seen something like this before? Any idea?

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  • edit sound files

    - by doug
    I have an audio file with a very bad recording (recording was made in very noisy conditions, at a conference). My recorder was too far from the speakers. Do you have any idea about how to improve the sound quality? Do you know any good resource for that?

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  • Remove noise from a recording

    - by essamSALAH
    I used to record important technical meetings and demos using Camtasia Studio, using a Mic to capture the speaker voice. Sometimes we invite attendees by asking them to call us in the meeting, and they would call on a cell phone then we switch it to loudspeaker so we can hear and talk to them and also record the conversation on Camtasia. The problem I am having now is that playing back those recording produces the regular noise that results from the microphone being close to the mobile phone (the kind of noise you hear when your mobile phone rings and it is near a speaker). Any advice on removing this noise?

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  • Too big a difference between Loud and Quiet when watching DVD's... constantly have to adjust volume.

    - by Dan
    It is hard for me to find the right volume for my computer to watch my dvd's on because it seems like most reasonable volumes become overwhelming at the loudest parts of a movie and it is hard to even make out the dialog at the quietest parts. I find I'm constantly adjusting the volume during the course of a movie. Are there ways to make the difference between the louds and the quiets not so extreme? (both computer related solutions and non-computer related solutions welcome). Like moving my speakers across the room and increasing the volume? or the opposite? Or would would the extremes be less noticeable if I used headphones? Are there movie players that might have more complex sound adjustment features? If there is a software solution out there for linux that would be great too. Thanks, Dan

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  • is there a way to automate changing filenames in <link> , <script> tags

    - by nepsdotin
    when we use Expires header for text files like js, css, contents are cached in the browser, to get new content we need to change in the html file the new names in the link and script tag. When we add changes. How can we automate it. I may have some bunch of html files in multiple folders also in subdirectories. There would be a text file filelist.txt OldName NewName oldfile1-ver-1.0.js oldfile1-ver-2.0.js oldfile2-ver-1.0.js oldfile2-ver-2.0.js oldfile3-ver-1.0.js oldfile3-ver-2.0.js oldfile4-ver-1.0.js oldfile4-ver-2.0.js The script should change all the oldfile1-ver-1.0.js into oldfile1-ver-2.0.js in the html, php files I would run this script before i start uploading. Finally the script could create a list of files and line number where it made the update. The solution can be in PERL/PHP/BATCH or anything thats nice and elegant

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  • Tool to convert a series of image into a single sprite sheet

    - by senbei
    Are there any known tools that can take a serie of pictures and generate a single sprite sheet from them? (ie. place all the images into a single image, one after the other). I have found some very basic software doing this, but I am looking for one that is able to detect duplicate frames as well as outputting some kind of data structure that allow me to programatically retrieve the coordinate of each frame on the generated image. I need this to convert existing animations with many duplicate frames and I am a bit surprised that there is no standard software to do this, as most infos you can find on the web about this is people doing this completely manually.. Any recommendations?

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