Hi,
Thanks for your response.
The phantom file is not the library, it is simply referencing a file with
my own method, a method that does what the post_handler you posted is
doing. This works perfectly locally. I don't think the issue is with that
file. There are other things I could not figure out which leads me to
believe my problem might be with my yaml file. For example, after I deploy
with :
gcloud -q preview app deploy app.yaml --version 1 --promote
and I have POST handlers such as the following in my code:
app.post('/postTEST', function(req, res) {
console.log('requrl', req.body);
res.status(200).send({'greetings': 'You made a POST request'});
});
going to /postTEST returns a 404. However, if this was a GET handler it
would work perfectly fine.
You can even test it yourself here:
Do a GET to the following URL :
https://thirdshelf-console-pdf-dot-thirdshelf-console-dev.appspot.com
and then try a POST at :
https://thirdshelf-console-pdf-dot-thirdshelf-console-dev.appspot.com/postTEST
Thanks Nicholas.
On Tuesday, May 31, 2016 at 11:35:52 AM UTC-4, Nicholas (Google Cloud
Support) wrote:
>
> Hello! Thanks for posting your questions here.
>
> Your GET and POST handlers are doing very different things in this case
> so I would not expect to receive the same response from both.
>
> The 502 Bad Gateway is most likely caused by phantom.takeScreenShot(url,
> response) and there. I could not find any such method listed in the PhantomJS
> documentation <http://phantomjs.org/screen-capture.html>. I did however
> find the documentation for the webpage module which provides screen
> capturing functionalities.
>
> In fact, there appear to be functions to accomplish exactly what you seek
> if I understood that correctly. The open(url, callback)
> <http://phantomjs.org/api/webpage/method/open.html> method issues the
> HTTP request and invokes the callback when done. The renderBase64(format)
> <http://phantomjs.org/api/webpage/method/render-base64.html> method
> renders the pages content in a given format and outputs the content in
> base64.
>
> The example provided in their documentation is fairly concise. Here's one
> with some additional error handling:
> // top of your program
> var webpage = require('webpage');
>
> // handler for your post request
> // issues HTTP request to given URL
> // returns base64-rendered screenshot on success
> // or error message on failure
> function post_handler(request, response) {
> var page = webpage.create();
>
> page.viewportSize = {
> 'width': 1920,
> 'height': 1080
> };
>
> page.open('https://www.google.com', function (status) {
> var base64;
>
> if (status === 'success') {
> base64 = page.renderBase64('PNG');
> return response.status(200).send({
> 'screenshot': base64
> });
> }
>
> response.status(200).send({
> 'error': 'Request to ' + page.url + ' returned with status ' +
> status
> });
> });
> }
>
>
> This seems to be the way their documentation suggests getting screen
> captures. Let me know if this works for you. If you still encounter errors,
> I would suggest adding listeners to onResourceError
> <http://phantomjs.org/api/webpage/handler/on-resource-error.html> and
> other error-related events. If getting unknown errors beyond that, please
> post some of your request logs from your application as they might have
> more relevant information.
>
> On Monday, May 30, 2016 at 9:42:45 PM UTC-4, Harris Robin Kalash wrote:
>>
>> So I deployed a nodeJS script on GAE and whenever I hit a POST endpoint I
>> get a 502 Bad Gateway error. The endpoint is a simple service that grabs a
>> screenshot of a page using phantomJS and returns a JSON that contains the
>> base64 representation of the image in it.
>>
>> Doing a GET to this endpoint works fine and returns a healthy 200
>> response, however as soon as I try a POST request I get: **502 Bad Gateway**
>>
>> Here is my **app.yaml**:
>>
>> service: pdf-service
>>
>> # [START runtime]
>> runtime: nodejs
>> vm: true
>> # [END runtime]
>>
>> threadsafe: yes
>>
>> # Temporary setting to keep gcloud from uploading node_modules
>> skip_files:
>> - ^node_modules$
>>
>> handlers:
>> - url: (.*)/
>> script: app.js
>> secure: always
>>
>>
>> My **app.js** script:
>>
>> 'use strict';
>>
>> var express = require('express');
>> var app = express();
>> var cors = require('cors');
>> var bodyParser = require('body-parser')
>> var phantom = require('./phantom');
>>
>> app.use(cors());
>> // parse application/x-www-form-urlencoded
>> app.use(bodyParser.urlencoded({ extended: false }))
>>
>> var tmpURL = 'https://www.google.com';
>> // [START hello_world]
>> // Say hello!
>> app.post('/', function(req, res) {
>> console.log('requrl', req.body);
>> phantom.takeScreenShot(tmpURL, res);
>> });
>>
>> app.get('/', function(req, res) {
>> res.status(200).send({'greetings': 'Hello World'});
>> });
>> // [END hello_world]
>>
>> if (module === require.main) {
>> // [START server]
>> // Start the server
>> var server = app.listen(process.env.PORT || 8080, function() {
>> var host = server.address().address;
>> var port = server.address().port;
>>
>> console.log('App listening at http://%s:%s', host, port);
>> });
>> // [END server]
>> }
>>
>> module.exports = app;
>>
>>
>> Notes:
>> **The code works on my local environment.**
>>
>>
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