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Posted to httpclient-users@hc.apache.org by Claudio Martella <cl...@tis.bz.it> on 2010/01/26 12:54:27 UTC
getting only the header
As I mentioned in the previous post, i'm using httpclient for a
webcrawler i'm writing. at the moment i'm doing something like this:
while(toVisit.size() > 0){
client.execute(method);
String mime = getContentType(method); // which
does method.getResponseHeader("Content-Type").getValue();
if(supportedMimes.contains(mime){
handle(method.getResponseBody());
} else {
continue;
}
}
the problem is that i can see that the crawler hangs up a lot of time
processing urls that are going to be ignored. so i guess it's
downloading the whole stream before ignoring it. is there a way i can
download just the header, check the content type and only then download
the stream (at the time of getResponseBody())?
TIA
/CM
--
Claudio Martella
Digital Technologies
Unit Research & Development - Analyst
TIS innovation park
Via Siemens 19 | Siemensstr. 19
39100 Bolzano | 39100 Bozen
Tel. +39 0471 068 123
Fax +39 0471 068 129
claudio.martella@tis.bz.it http://www.tis.bz.it
Short information regarding use of personal data. According to Section 13 of Italian Legislative Decree no. 196 of 30 June 2003, we inform you that we process your personal data in order to fulfil contractual and fiscal obligations and also to send you information regarding our services and events. Your personal data are processed with and without electronic means and by respecting data subjects' rights, fundamental freedoms and dignity, particularly with regard to confidentiality, personal identity and the right to personal data protection. At any time and without formalities you can write an e-mail to privacy@tis.bz.it in order to object the processing of your personal data for the purpose of sending advertising materials and also to exercise the right to access personal data and other rights referred to in Section 7 of Decree 196/2003. The data controller is TIS Techno Innovation Alto Adige, Siemens Street n. 19, Bolzano. You can find the complete information on the web site www.tis.bz.it.
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Re: getting only the header
Posted by Ken Krugler <kk...@transpac.com>.
On Jan 26, 2010, at 6:36am, Claudio Martella wrote:
> I see that you do:
>
> if (mimeTypes != null) {
> String mimeType =
> HttpUtils.getMimeTypeFromContentType(contentType);
> if (!mimeTypes.contains(mimeType)) {
> throw new AbortedFetchException(url, "Invalid
> mime-type: " + mimeType, AbortedFetchReason.INVALID_MIMETYPE);
> }
> }
>
> my question is then: what is it done at the caller side with the
> handling of AbortedFetchException handling the httpclient?
Nothing. The finally {} block for where that exception is thrown calls
safeAbort with the HttpGet object, and that in turn calls
request.abort().
-- Ken
>
>
>
>
> Ken Krugler wrote:
>>
>> On Jan 26, 2010, at 3:54am, Claudio Martella wrote:
>>
>>> As I mentioned in the previous post, i'm using httpclient for a
>>> webcrawler i'm writing. at the moment i'm doing something like this:
>>>
>>>
>>> while(toVisit.size() > 0){
>>>
>>> client.execute(method);
>>> String mime = getContentType(method); // which
>>> does method.getResponseHeader("Content-Type").getValue();
>>>
>>> if(supportedMimes.contains(mime){
>>> handle(method.getResponseBody());
>>> } else {
>>> continue;
>>> }
>>> }
>>>
>>> the problem is that i can see that the crawler hangs up a lot of
>>> time
>>> processing urls that are going to be ignored. so i guess it's
>>> downloading the whole stream before ignoring it. is there a way i
>>> can
>>> download just the header, check the content type and only then
>>> download
>>> the stream (at the time of getResponseBody())?
>>
>> See the code I'd previously referenced for an example of exactly
>> that.
>>
>> http://github.com/bixo/bixo/blob/master/src/main/java/bixo/fetcher/http/SimpleHttpFetcher.java
>>
>>
>> Make sure you abort the request if you skip getting the response.
>>
>> -- Ken
>>
>>
>> --------------------------------------------
>> Ken Krugler
>> +1 530-210-6378
>> http://bixolabs.com
>> e l a s t i c w e b m i n i n g
>>
>>
>>
>>
>>
>
>
> --
> Claudio Martella
> Digital Technologies
> Unit Research & Development - Analyst
>
> TIS innovation park
> Via Siemens 19 | Siemensstr. 19
> 39100 Bolzano | 39100 Bozen
> Tel. +39 0471 068 123
> Fax +39 0471 068 129
> claudio.martella@tis.bz.it http://www.tis.bz.it
>
> Short information regarding use of personal data. According to
> Section 13 of Italian Legislative Decree no. 196 of 30 June 2003, we
> inform you that we process your personal data in order to fulfil
> contractual and fiscal obligations and also to send you information
> regarding our services and events. Your personal data are processed
> with and without electronic means and by respecting data subjects'
> rights, fundamental freedoms and dignity, particularly with regard
> to confidentiality, personal identity and the right to personal data
> protection. At any time and without formalities you can write an e-
> mail to privacy@tis.bz.it in order to object the processing of your
> personal data for the purpose of sending advertising materials and
> also to exercise the right to access personal data and other rights
> referred to in Section 7 of Decree 196/2003. The data controller is
> TIS Techno Innovation Alto Adige, Siemens Street n. 19, Bolzano. You
> can find the complete information on the web site www.tis.bz.it.
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: httpclient-users-unsubscribe@hc.apache.org
> For additional commands, e-mail: httpclient-users-help@hc.apache.org
>
--------------------------------------------
Ken Krugler
+1 530-210-6378
http://bixolabs.com
e l a s t i c w e b m i n i n g
---------------------------------------------------------------------
To unsubscribe, e-mail: httpclient-users-unsubscribe@hc.apache.org
For additional commands, e-mail: httpclient-users-help@hc.apache.org
Re: getting only the header
Posted by Claudio Martella <cl...@tis.bz.it>.
I see that you do:
if (mimeTypes != null) {
String mimeType =
HttpUtils.getMimeTypeFromContentType(contentType);
if (!mimeTypes.contains(mimeType)) {
throw new AbortedFetchException(url, "Invalid
mime-type: " + mimeType, AbortedFetchReason.INVALID_MIMETYPE);
}
}
my question is then: what is it done at the caller side with the
handling of AbortedFetchException handling the httpclient?
Ken Krugler wrote:
>
> On Jan 26, 2010, at 3:54am, Claudio Martella wrote:
>
>> As I mentioned in the previous post, i'm using httpclient for a
>> webcrawler i'm writing. at the moment i'm doing something like this:
>>
>>
>> while(toVisit.size() > 0){
>>
>> client.execute(method);
>> String mime = getContentType(method); // which
>> does method.getResponseHeader("Content-Type").getValue();
>>
>> if(supportedMimes.contains(mime){
>> handle(method.getResponseBody());
>> } else {
>> continue;
>> }
>> }
>>
>> the problem is that i can see that the crawler hangs up a lot of time
>> processing urls that are going to be ignored. so i guess it's
>> downloading the whole stream before ignoring it. is there a way i can
>> download just the header, check the content type and only then download
>> the stream (at the time of getResponseBody())?
>
> See the code I'd previously referenced for an example of exactly that.
>
> http://github.com/bixo/bixo/blob/master/src/main/java/bixo/fetcher/http/SimpleHttpFetcher.java
>
>
> Make sure you abort the request if you skip getting the response.
>
> -- Ken
>
>
> --------------------------------------------
> Ken Krugler
> +1 530-210-6378
> http://bixolabs.com
> e l a s t i c w e b m i n i n g
>
>
>
>
>
--
Claudio Martella
Digital Technologies
Unit Research & Development - Analyst
TIS innovation park
Via Siemens 19 | Siemensstr. 19
39100 Bolzano | 39100 Bozen
Tel. +39 0471 068 123
Fax +39 0471 068 129
claudio.martella@tis.bz.it http://www.tis.bz.it
Short information regarding use of personal data. According to Section 13 of Italian Legislative Decree no. 196 of 30 June 2003, we inform you that we process your personal data in order to fulfil contractual and fiscal obligations and also to send you information regarding our services and events. Your personal data are processed with and without electronic means and by respecting data subjects' rights, fundamental freedoms and dignity, particularly with regard to confidentiality, personal identity and the right to personal data protection. At any time and without formalities you can write an e-mail to privacy@tis.bz.it in order to object the processing of your personal data for the purpose of sending advertising materials and also to exercise the right to access personal data and other rights referred to in Section 7 of Decree 196/2003. The data controller is TIS Techno Innovation Alto Adige, Siemens Street n. 19, Bolzano. You can find the complete information on the web site www.tis.bz.it.
---------------------------------------------------------------------
To unsubscribe, e-mail: httpclient-users-unsubscribe@hc.apache.org
For additional commands, e-mail: httpclient-users-help@hc.apache.org
Re: getting only the header
Posted by Ken Krugler <kk...@transpac.com>.
On Jan 26, 2010, at 3:54am, Claudio Martella wrote:
> As I mentioned in the previous post, i'm using httpclient for a
> webcrawler i'm writing. at the moment i'm doing something like this:
>
>
> while(toVisit.size() > 0){
>
> client.execute(method);
> String mime = getContentType(method); // which
> does method.getResponseHeader("Content-Type").getValue();
>
> if(supportedMimes.contains(mime){
> handle(method.getResponseBody());
> } else {
> continue;
> }
> }
>
> the problem is that i can see that the crawler hangs up a lot of time
> processing urls that are going to be ignored. so i guess it's
> downloading the whole stream before ignoring it. is there a way i can
> download just the header, check the content type and only then
> download
> the stream (at the time of getResponseBody())?
See the code I'd previously referenced for an example of exactly that.
http://github.com/bixo/bixo/blob/master/src/main/java/bixo/fetcher/http/SimpleHttpFetcher.java
Make sure you abort the request if you skip getting the response.
-- Ken
--------------------------------------------
Ken Krugler
+1 530-210-6378
http://bixolabs.com
e l a s t i c w e b m i n i n g