No date response header in node.js 0.8 - http

According to the documentation the Date response header should be sent by default.
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');
Curling the sample above I get:
C:\Users\Hans>curl localhost:1337 -i
HTTP/1.1 200 OK
Content-Type: text/plain
Connection: keep-alive
Transfer-Encoding: chunked
Hello World
No Date header. Even when I set response.sendDate = true I get no Date header. What is wrong?

Upgraded from 0.8.1 to 0.8.2 and now it works
C:\Users\Hans>curl localhost:1337 -i
HTTP/1.1 200 OK
Content-Type: text/plain
Date: Fri, 13 Jul 2012 10:52:59 GMT
Connection: keep-alive
Transfer-Encoding: chunked
Hello World

Related

OkHttp3: Getting an 'unexpected end of stream' exception while reading a large HTTP response

I have a Java client, that is making a POST call to the v1/graphql endpoint of a Hasura server (v1.3.3)
I'm making the HTTP call using the Square okhttp3 library (v4.9.1). The data transfer is happening over HTTP1.1, using chunked transfer-encoding.
The client is failing with the following error:
Caused by: java.net.ProtocolException: unexpected end of stream
at okhttp3.internal.http1.Http1ExchangeCodec$ChunkedSource.read(Http1ExchangeCodec.kt:415) ~[okhttp-4.9.1.jar:?]
at okhttp3.internal.connection.Exchange$ResponseBodySource.read(Exchange.kt:276) ~[okhttp-4.9.1.jar:?]
at okio.RealBufferedSource.read(RealBufferedSource.kt:189) ~[okio-jvm-2.8.0.jar:?]
at okio.RealBufferedSource.exhausted(RealBufferedSource.kt:197) ~[okio-jvm-2.8.0.jar:?]
at okio.InflaterSource.refill(InflaterSource.kt:112) ~[okio-jvm-2.8.0.jar:?]
at okio.InflaterSource.readOrInflate(InflaterSource.kt:76) ~[okio-jvm-2.8.0.jar:?]
at okio.InflaterSource.read(InflaterSource.kt:49) ~[okio-jvm-2.8.0.jar:?]
at okio.GzipSource.read(GzipSource.kt:69) ~[okio-jvm-2.8.0.jar:?]
at okio.Buffer.writeAll(Buffer.kt:1642) ~[okio-jvm-2.8.0.jar:?]
at okio.RealBufferedSource.readString(RealBufferedSource.kt:95) ~[okio-jvm-2.8.0.jar:?]
at okhttp3.ResponseBody.string(ResponseBody.kt:187) ~[okhttp-4.9.1.jar:?]
Request Headers:
INFO: Content-Type: application/json; charset=utf-8
INFO: Content-Length: 1928
INFO: Host: localhost:10191
INFO: Connection: Keep-Alive
INFO: Accept-Encoding: gzip
INFO: User-Agent: okhttp/4.9.1
Response headers:
INFO: Transfer-Encoding: chunked
INFO: Date: Tue, 27 Apr 2021 12:06:39 GMT
INFO: Server: Warp/3.3.10
INFO: x-request-id: d019408e-e2e3-4583-bcd6-050d4a496b11
INFO: Content-Type: application/json; charset=utf-8
INFO: Content-Encoding: gzip
This is the client code used for the making the POST call:
private static final MediaType MEDIA_TYPE_JSON = MediaType.parse("application/json; charset=utf-8");
private static OkHttpClient okHttpClient = new OkHttpClient.Builder()
.connectTimeout(30, TimeUnit.SECONDS)
.writeTimeout(5, TimeUnit.MINUTES)
.readTimeout(5, TimeUnit.MINUTES)
.addNetworkInterceptor(loggingInterceptor)
.build();
public GenericHttpResponse httpPost(String url, String textBody, GenericHttpMediaType genericMediaType) throws HttpClientException {
RequestBody body = RequestBody.create(okHttpMediaType, textBody);
Request postRequest = new Request.Builder().url(url).post(body).build();
Call postCall = okHttpClient.newCall(okHttpRequest);
Response postResponse = postCall.execute();
return GenericHttpResponse
.builder()
.body(okHttpResponse.body().string())
.headers(okHttpResponse.headers().toMultimap())
.code(okHttpResponse.code())
.build();
}
This failure is only happening for large response sizes. As per the server logs, the response size (after gzip encoding) is around 52MB, but the call is still failing. This same code has been working fine for response sizes around 10-15MB.
I tried replicating the same issue through a simple cURL call, but that ran successfully:
curl -v -s --request POST 'http://<hasura_endpoint>/v1/graphql' \
--header 'Content-Type: application/json' \
--header 'Accept-Encoding: gzip, deflate, br' \
--data-raw '...'
* Trying ::1...
* TCP_NODELAY set
* Connected to <host> (::1) port <port> (#0)
> POST /v1/graphql HTTP/1.1
> Host: <host>:<port>
> User-Agent: curl/7.64.1
> Accept: */*
> Content-Type: application/json
> Accept-Encoding: gzip, deflate, br
> Content-Length: 1840
> Expect: 100-continue
>
< HTTP/1.1 100 Continue
} [1840 bytes data]
* We are completely uploaded and fine
< HTTP/1.1 200 OK
< Transfer-Encoding: chunked
< Date: Tue, 27 Apr 2021 11:59:24 GMT
< Server: Warp/3.3.10
< x-request-id: 27e3ff3f-8b95-4328-a1bc-a5492e68f995
< Content-Type: application/json; charset=utf-8
< Content-Encoding: gzip
<
{ [6 bytes data]
* Connection #0 to host <host> left intact
* Closing connection 0
So I'm assuming that this error is specific to the Java client.
Based on suggestions provided in similar posts, I tried the following other approaches:
Adding a Connection: close header to the request
Sending Transfer-Encoding: gzip header in the request
Setting the retryOnConnectionFailure for the OkHttp client to true
But none of these approaches were able to resolve the issue.
So, my questions are:
What could be the underlying cause for this issue? Since I'm using chunked transfer encoding here, I suppose it's not due to an incorrect content-length header passed in the response.
What are the approaches I can try for debugging this further?
Would really appreciate any insights on this. Thank you.

How to generate Python XHR Request in requests.post()

I am trying to get info from a website using AJAX. The Website showing different size for perfume and basically, the price would change when selecting different size.
I checked chrome Network Tab and found it's a XHR request, but looking at the request head I have no idea how to generate the same headers and data with the Requests package.
This is how my code currently looks like:
import requests
url = "https://www.beautyfresh.com/uc_aac"
session = requests.Session()
data = {"attributes[Size]":"100ml"} # I want to get the price for 100ml
headers = {"Referer": "https://www.beautyfresh.com/product/fragrance/men/perfume-fragrance/women/perfume-men/fragrance/perfume/jo-malone-orange-blossom-cologne",}
r = session.post(url,headers=headers,data=data)
print(r.text)
The General information under Chrome Network tab is
Request URL: https://www.beautyfresh.com/uc_aac
Request Method: POST
Status Code: 200 OK
Remote Address: 103.255.250.100:443
Referrer Policy: no-referrer-when-downgrade
The Response Headers is
HTTP/1.1 200 OK
date: Fri, 18 Dec 2020 02:01:05 GMT
expires: Sun, 19 Nov 1978 05:00:00 GMT
x-site: beautyfresh
x-url: /uc_aac
last-modified: Fri, 18 Dec 2020 02:01:05 GMT
x-backend-server: web4
content-type: application/json
x-varnish: 700512226
age: 0
via: 1.1 varnish (Varnish/6.0)
x-cache: MISS
cache-control: Cache-Control: store, no-cache, must-revalidate
accept-ranges: bytes
content-length: 2193
The Request Headers is
POST /uc_aac HTTP/1.1
Host: www.beautyfresh.com
Connection: keep-alive
Content-Length: 164
Accept: application/json, text/javascript, */*; q=0.01
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_1_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
Content-Type: application/x-www-form-urlencoded
Origin: https://www.beautyfresh.com
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://www.beautyfresh.com/product/fragrance/men/perfume-fragrance/women/perfume-men/fragrance/perfume/jo-malone-orange-blossom-cologne
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: has_js=1; SESSc5f2026dce40de323b60d32130e6ce0b=n7tr5e2fsragf1js6garc6u06n; _ga=GA1.2.959938064.1608216963; _gid=GA1.2.1979056032.1608216963; _v1EmaticSolutionsUTMData=%7B%22utm_source%22%3A%22%22%2C%22utm_medium%22%3A%22%22%2C%22utm_campaign%22%3A%22%22%7D; _fbp=fb.1.1608216963288.1600789170; _v1EmaticSolutionsBye=%7B%2228732%22%3A%7B%2230038%22%3A%7B%22dont_show_till%22%3A%222020-12-20%22%2C%22loop%22%3A1%7D%7D%2C%2228739%22%3A%7B%2230045%22%3A%7B%22dont_show_till%22%3A%222020-12-20%22%2C%22loop%22%3A1%7D%7D%7D; _v1EmaticSolutionsEI=%7B%22c_28739_1%22%3A%5B1%2C1608216997180%2C33181%5D%2C%22c_28732_2%22%3A%5B1%2C1608216969616%2C0%5D%7D; _v1EmaticSolutions=%5B%22fc5d18b3-4077-11eb-970e-0242ac160003%22%2C1608217230870%2C%5B%22IMG%22%2C%22%22%2C1%2C%22glasshouse_fragrances_amalfi_coast_sea_candle_350gr.jpg%22%5D%5D; __atuvc=8%7C51; __atuvs=5fdc0d5961186ea4000; _gat=1; _dc_gtm_UA-63339192-1=1
And Form Data shows:
attributes%5BSize%5D=100ml&nid=2905&qty=1&form_build_id=form-991e88780c30fdf883375a36a986b550&form_id=uc_product_add_to_cart_form_2905&product-nid=2905&aac_nid=2905
I don't actually know how to construct my request so it can be successfully posted to the server the get the proper response. It should return the price for "100ml", but currently my code get nothing.
Thank you so much for any help!
You are missing some information in your data. To receive a response, try adding "aac_nid": "2905" to your data when sending the post request:
import requests
headers = {
"Referer": "https://www.beautyfresh.com/product/fragrance/men/perfume-fragrance/women/perfume-men/fragrance/perfume/jo-malone-orange-blossom-cologne",
}
data = {"attributes[Size]": "30ml", "aac_nid": "2905"}
response = requests.post(
"https://www.beautyfresh.com/uc_aac", headers=headers, data=data
)
>>> print(response.content)
b'{"nid":"2905","model":"690251006564","replacements":{"sellprice":"<div class=\\"product-info sellprice\\"><div class=\'retail_price\'>City Price: <div class=\'product-info retail_price\'><span class=\'uc-price\'>S$110.00<\\/span><\\/div><\\/div>\\r\\n <div class=\'promoprice\'>Our Price: <div class=\'product-info sellprice1\'><span class=\'uc-price\'>S$89.00<\\/span><\\/div><\\/div><\\/div>","model":"<div class=\\"model\\"><span class=\\"label\\">Product Code: <\\/span>690251006564<\\/div>"},"form":"<form action=\\"\\/uc_aac\\" accept-charset=\\"UTF-8\\" method=\\"post\\" id=\\"uc-product-add-to-cart-form\\" class=\\" uc-aac-cart\\">\\n<div><div class=\'attributes\'><div class=\\"form-item\\" id=\\"edit-attributes-Size-wrapper\\">\\n <label for=\\"edit-attributes-Size\\">Size <span class=\\"form-required\\" title=\\"This field is required.\\">*<\\/span><\\/label>\\n <select name=\\"attributes[Size]\\" class=\\"form-select required chosen-widget\\" data-name=\\"Size\\" id=\\"edit-attributes-Size\\" ><option value=\\"30ml\\" selected=\\"selected\\">30ml<\\/option><option value=\\"100ml\\">100ml<\\/option><\\/select>\\n<\\/div>\\n<\\/div><input type=\\"hidden\\" name=\\"nid\\" id=\\"edit-nid\\" value=\\"2905\\" \\/>\\n<div class=\\"form-item\\" id=\\"edit-qty-wrapper\\">\\n <label for=\\"edit-qty\\">Qty <\\/label>\\n <input type=\\"text\\" maxlength=\\"3\\" name=\\"qty\\" id=\\"edit-qty\\" size=\\"5\\" value=\\"1\\" class=\\"form-text textfield\\" \\/>\\n<\\/div>\\n<input type=\\"hidden\\" name=\\"form_build_id\\" id=\\"form-b7adf002178f04ed96377894057352a2\\" value=\\"form-b7adf002178f04ed96377894057352a2\\" \\/>\\n<input type=\\"hidden\\" name=\\"form_id\\" id=\\"edit-uc-product-add-to-cart-form\\" value=\\"uc_product_add_to_cart_form\\" \\/>\\n<input type=\\"hidden\\" name=\\"aac_nid\\" id=\\"edit-aac-nid\\" value=\\"2905\\" \\/>\\n<div class=\'leadtime_message\' style=\'margin-bottom:1em;\'><p>Delivers in 1-3 working days<\\/p><\\/div><input type=\\"submit\\" name=\\"op\\" id=\\"edit-submit-2905\\" value=\\"Add to Cart\\" class=\\"notranslate form-submit node-add-to-cart primary\\" \\/>\\n\\n<\\/div><\\/form>\\n"}'
To get the price, try searching for it with the help of the built-in re (regex) module:
import re
prices = re.findall(r"'uc-price\\'>S(\$\d.*?)<", str(response.content))
print("Original Price:", prices[0])
print("Our Price:", prices[1])
Output:
Original Price: $110.00
Our Price: $89.00

TikaJAXRS PUT from Python client

Apache Tika should be accessible from Python program via HTTP, but I can't get it to work.
I am using this command to run the server (with and without the two options at the end):
java -jar tika-server-1.17.jar --port 5677 -enableUnsecureFeatures -enableFileUrl
And it works fine with curl:
curl -v -T /tmp/tmpsojwBN http://localhost:5677/tika
* Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 5677 (#0)
> PUT /tika HTTP/1.1
> Host: localhost:5677
> User-Agent: curl/7.47.0
> Accept: */*
> Accept-Encoding: gzip, deflate
> Content-Length: 418074
> Expect: 100-continue
>
< HTTP/1.1 100 Continue
* We are completely uploaded and fine
< HTTP/1.1 200 OK
< Content-Type: text/plain
< Date: Sat, 07 Apr 2018 12:28:41 GMT
< Transfer-Encoding: chunked
< Server: Jetty(8.y.z-SNAPSHOT)
But when I try something like (tried different combinations for headers, here I recreated same headers as python-tika client uses):
with tempfile.NamedTemporaryFile() as tmp_file:
download_file(url, tmp_file)
payload = open(tmp_file.name, 'rb')
headers = {
'Accept': 'application/json',
'Content-Disposition': 'attachment; filename={}'.format(
os.path.basename(tmp_file.name))}
response = requests.put(TIKA_ENDPOINT_URL + '/tika', payload,
headers=headers,
verify=False)
I've tried to use payload as well as fileUrl - with the same result of WARN javax.ws.rs.ClientErrorException: HTTP 406 Not Acceptable and java stack trace on the server. Full trace:
WARN javax.ws.rs.ClientErrorException: HTTP 406 Not Acceptable
at org.apache.cxf.jaxrs.utils.SpecExceptions.toHttpException(SpecExceptions.java:117)
at org.apache.cxf.jaxrs.utils.ExceptionUtils.toHttpException(ExceptionUtils.java:173)
at org.apache.cxf.jaxrs.utils.JAXRSUtils.findTargetMethod(JAXRSUtils.java:542)
at org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.processRequest(JAXRSInInterceptor.java:177)
at org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.handleMessage(JAXRSInInterceptor.java:77)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:274)
at org.apache.cxf.transport.http_jetty.JettyHTTPDestination.doService(JettyHTTPDestination.java:261)
at org.apache.cxf.transport.http_jetty.JettyHTTPHandler.handle(JettyHTTPHandler.java:76)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1088)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1024)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:973)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1035)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:641)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:231)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:748)
I've also tried to compare ( with nc -l localhost 5677 | less) what is so different with two requests (payload abbreviated):
From curl:
PUT /tika HTTP/1.1
Host: localhost:5677
User-Agent: curl/7.47.0
Accept: */*
Content-Length: 418074
Expect: 100-continue
%PDF-1.4
%<D3><EB><E9><E1>
1 0 obj
<</Creator (Chromium)
From Python requests library:
PUT /tika HTTP/1.1
Host: localhost:5677
Connection: keep-alive
Accept-Encoding: gzip, deflate
Accept: application/json
User-Agent: python-requests/2.13.0
Content-type: application/pdf
Content-Length: 246176
%PDF-1.4
%<D3><EB><E9><E1>
1 0 obj
<</Creator (Chromium)
The question is, what is the correct way to call Tika server from Python?
I've also tried python tika library in client-only mode and using tika-app via jnius. With tika client, as well as using tika-app.jar with pyjnius, I only freezes (call never returns) when I use them in a celery worker. At the same, pyjnius / tika-app and tika-python script both work nicely in a script: I have not figured out what is wrong inside celery worker. I guess, something to do with threading and/or initialization in wrong place. But that is a topic for another question.
And here is what tika-python requests:
PUT /tika HTTP/1.1
Host: localhost:5677
Connection: keep-alive
Accept-Encoding: gzip, deflate
Accept: application/json
User-Agent: python-requests/2.13.0
Content-Disposition: attachment; filename=tmpb3YkTq
Content-Length: 183234
%PDF-1.4
%<D3><EB><E9><E1>
1 0 obj
<</Creator (Chromium)
And now it seems like this is some kind of a problem with tika server:
$ tika-python --verbose --server 'localhost' --port 5677 parse all /tmp/tmpb3YkTq
2018-04-08 09:44:11,555 [MainThread ] [INFO ] Writing ./tmpb3YkTq_meta.json
(<open file '<stderr>', mode 'w' at 0x7f0b688eb1e0>, 'Request headers: ', {'Accept': 'application/json', 'Content-Disposition': 'attachment; filename=tmpb3YkTq'})
(<open file '<stderr>', mode 'w' at 0x7f0b688eb1e0>, 'Response headers: ', {'Date': 'Sun, 08 Apr 2018 06:44:13 GMT', 'Transfer-Encoding': 'chunked', 'Content-Type': 'application/json', 'Server': 'Jetty(8.y.z-SNAPSHOT)'})
['./tmpb3YkTq_meta.json']
Cf:
$ tika-python --verbose --server 'localhost' --port 5677 parse text /tmp/tmpb3YkTq
2018-04-08 09:43:38,326 [MainThread ] [INFO ] Writing ./tmpb3YkTq_meta.json
(<open file '<stderr>', mode 'w' at 0x7fc3eee4a1e0>, 'Request headers: ', {'Accept': 'application/json', 'Content-Disposition': 'attachment; filename=tmpb3YkTq'})
(<open file '<stderr>', mode 'w' at 0x7fc3eee4a1e0>, 'Response headers: ', {'Date': 'Sun, 08 Apr 2018 06:43:38 GMT', 'Content-Length': '0', 'Server': 'Jetty(8.y.z-SNAPSHOT)'})
2018-04-08 09:43:38,409 [MainThread ] [WARNI] Tika server returned status: 406
['./tmpb3YkTq_meta.json']

how to change standard header value in restlets?

I have the following get:
#Get
public String represent(Variant variant) throws ResourceException
{
String text = "returntext";
text+="\r\n";
return text;
}
The response from invoking this service:
CFG - HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Type: text/plain;charset=UTF-8
Date: Mon, 29 Jul 2013 19:59:37 GMT
Server: Restlet-Framework/2.0.9
Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept
Content-Length: 118
Connection: keep-alive
How do I change the connection header value to close ?
I think this maybe a restlet bug.
Whether the server closes the connection or not, depends on whether the client request asks for the connection to close or not.
Here is a sample Server code:
import org.restlet.data.Form;
import org.restlet.data.MediaType;
import org.restlet.data.Parameter;
import org.restlet.resource.Get;
import org.restlet.resource.ServerResource;
import org.restlet.util.Series;
public class TestRestlet extends ServerResource {
#Get
public String getImpl(){
return "Sample Response Text\r\n";
}
}
And here is what i got on linux commmand line (using only telnet):
[Please note that the last line in request-header in each request is followed by 2 newlines] [To avoid any confusion, some of the requests do not contain request-body.]
[root#mylinuxserver]# telnet 172.16.101.34 6060
Trying 172.16.101.34...
Connected to win7comp01 (172.16.101.34).
Escape character is '^]'.
GET /TestRestlet HTTP/1.1
Host: 172.16.101.34:6060
HTTP/1.1 200 OK
Set-Cookie: JSESSIONID=C2E77F4D0437E525A0FC66498EF09E8B; Path=/hotelSoft
Date: Wed, 31 Jul 2013 08:25:44 GMT
Accept-Ranges: bytes
Server: Restlet-Framework/2.0.15
Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept
Content-Type: application/json;charset=UTF-8
Content-Length: 22
Sample Response Text
GET /TestRestlet HTTP/1.1
Host: 172.16.101.34:6060
Connection: Keep-Alive
HTTP/1.1 200 OK
Set-Cookie: JSESSIONID=1873DE26443F5DF62379B895AEA0F004; Path=/hotelSoft
Date: Wed, 31 Jul 2013 08:25:48 GMT
Accept-Ranges: bytes
Server: Restlet-Framework/2.0.15
Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept
Content-Type: application/json;charset=UTF-8
Content-Length: 22
Sample Response Text
GET /TestRestlet HTTP/1.1
Host: 172.16.101.34:6060
Connection: close
HTTP/1.1 200 OK
Set-Cookie: JSESSIONID=43EC7C9AACC6C0CEF6FAC8F608B1D79C; Path=/hotelSoft
Date: Wed, 31 Jul 2013 08:25:57 GMT
Accept-Ranges: bytes
Server: Restlet-Framework/2.0.15
Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept
Content-Type: application/json;charset=UTF-8
Content-Length: 22
Connection: close
Sample Response Text
Connection closed by foreign host.
[root#mylinuxserver]# telnet 172.16.101.34 6060
Trying 172.16.101.34...
Connected to win7comp01 (172.16.101.34).
Escape character is '^]'.
GET /TestRestlet HTTP/1.0
HTTP/1.1 200 OK
Set-Cookie: JSESSIONID=2C879A91F2501DD9D3B39EF50C3F46CA; Path=/hotelSoft
Date: Wed, 31 Jul 2013 08:26:09 GMT
Accept-Ranges: bytes
Server: Restlet-Framework/2.0.15
Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept
Content-Type: application/json;charset=UTF-8
Content-Length: 22
Connection: close
Sample Response Text
Connection closed by foreign host.
[root#mylinuxserver]# telnet 172.16.101.34 6060
Trying 172.16.101.34...
Connected to win7comp01 (172.16.101.34).
Escape character is '^]'.
GET /TestRestlet
Sample Response Text
Connection closed by foreign host.
[root#mylinuxserver]#
In the above examples, several types of HTTP connections are made.
The response to the 1st request:
GET /TestRestlet HTTP/1.1
Host: 172.16.101.34:6060
[Note: the line Host: 172.16.101.34:6060 is followed by 2 \r\n: \r\n\r\n]
is:
HTTP/1.1 200 OK
Set-Cookie: JSESSIONID=C2E77F4D0437E525A0FC66498EF09E8B; Path=/hotelSoft
Date: Wed, 31 Jul 2013 08:25:44 GMT
Accept-Ranges: bytes
Server: Restlet-Framework/2.0.15
Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept
Content-Type: application/json;charset=UTF-8
Content-Length: 22
Sample Response Text
The connection is not closed yet, and we send another request:
GET /TestRestlet HTTP/1.1
Host: 172.16.101.34:6060
Connection: Keep-Alive
That gets the response:
HTTP/1.1 200 OK
Set-Cookie: JSESSIONID=1873DE26443F5DF62379B895AEA0F004; Path=/hotelSoft
Date: Wed, 31 Jul 2013 08:25:48 GMT
Accept-Ranges: bytes
Server: Restlet-Framework/2.0.15
Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept
Content-Type: application/json;charset=UTF-8
Content-Length: 22
Still the connection is not closed.
However on the 3rd request:
GET /TestRestlet HTTP/1.1
Host: 172.16.101.34:6060
Connection: close
The connection is closed, because the request contains Connection: close header.
You can see the telnet exits after displaying a message: Connection closed by foreign host.
There are 2 more sample request-response in the above given examples:
1.An HTTP 1.0 request:
GET /TestRestlet HTTP/1.0
With response:
HTTP/1.1 200 OK
Set-Cookie: JSESSIONID=2C879A91F2501DD9D3B39EF50C3F46CA; Path=/hotelSoft
Date: Wed, 31 Jul 2013 08:26:09 GMT
Accept-Ranges: bytes
Server: Restlet-Framework/2.0.15
Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept
Content-Type: application/json;charset=UTF-8
Content-Length: 22
Connection: close
Sample Response Text
And the telnet exits after displaying: Connection closed by foreign host.
2.A request without HTTP version mentioned:
GET /TestRestlet
And response is: (Without headers)
Sample Response Text
And the telnet exits with a message: Connection closed by foreign host.
Conclusion:
Whatever is your client / client-program , make it send an HTTP-1.0 request , or a HTTP-1.1 request with Connection: close header.
In Java, you achieve this by:
import java.net.HttpURLConnection;
import java.net.URL;
.
.
.
HttpURLConnection httpURLConnection = (HttpURLConnection) new URL("http://....").openConnection();
httpURLConnection.setRequestProperty("Connection","close");
// rest of the code here....
Also check if a statement like this:
httpURLConnection.disconnect();
can help you disconnect the connection.

urlopen debug doesn't show header values

In python3 ,I was trying to see the header values sent in the request
>>from urllib.request import urlopen
>> url1='http://diveintopython3.org/examples/feed.xml'
>>from http.client import HTTPConnection as httpcon
>>httpcon.debuglevel = 1
>>resp1 = urlopen(url1)
this produced
send: b'GET /examples/feed.xml HTTP/1.1\r\nAccept-Encoding: identity\r\nHost: diveintopython3.org\r\nUser-Agent: Python-urllib/3.3\r\nConnection: close\r\n\r\n'
reply: 'HTTP/1.1 200 OK\r\n'
header: Cache-Control header: Pragma header: Content-Type header: Expires header: Server header: X-AspNet-Version header: X-Powered-By header: Date header: Content-Length header: Age header: Connection
whereas curl gives me the header values
$curl -I http://diveintopython3.org/examples/feed.xml
HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 783
Content-Type: text/html; charset=utf-8
Expires: -1
Server: ATS/3.2.4
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Fri, 31 May 2013 02:48:12 GMT
Age: 0
Connection: keep-alive
what should I do to get the header values listed (as debug info) in python3 ?
The object returned by urllib.request.urlopen being an http.client.HTTPResponse object, you can use all of the methods it defines. There is one called getheaders which does what you want:
>>> from urllib.request import urlopen
>>> url1 = 'http://diveintopython3.org/examples/feed.xml'
>>> r = urlopen(url1)
>>> r.getheaders()
[('Cache-Control', 'no-cache'), ('Pragma', 'no-cache'), ('Content-Type', 'text/html; charset=utf-8'), ('Expires', '-1'), ('Server', 'ATS/3.2.4'), ('X-AspNet-Version', '4.0.30319'), ('X-Powered-By', 'ASP.NET'), ('Date', 'Fri, 31 May 2013 11:43:46 GMT'), ('Content-Length', '783'), ('Age', '0'), ('Connection', 'close')]
See the http.client documentation for more infos.

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