WEBVTT 00:00.230 --> 00:07.070 In the last modules we were talking about the content negotiation in the Http protocol and how the quality 00:07.070 --> 00:12.680 parameter helps a client decide what is the content that it wants. 00:13.300 --> 00:19.900 So continuing with that today, we'll be talking about the excerpt and the content language headers 00:19.900 --> 00:21.550 in the Http protocol. 00:23.700 --> 00:32.520 So by the name itself Accept language header tells that it basically is used to determine on what is 00:32.520 --> 00:34.980 the language that client prefers. 00:35.830 --> 00:37.330 Within the response. 00:37.870 --> 00:44.530 So we have already seen this example where in the Excel language there are three languages over here 00:44.530 --> 00:48.250 and each of the languages associated with a parameter. 00:48.610 --> 00:51.400 So the first preference is the Danish. 00:51.430 --> 00:59.290 Second preference becomes British English because it has a score of 0.8 and the last preference is 0.7. 01:00.490 --> 01:06.880 So accept language header is very useful in a website which has multiple languages. 01:07.120 --> 01:11.230 So let's see on how it will help us. 01:12.070 --> 01:16.950 So let's say this is a server which is example.com, which has two variants. 01:16.960 --> 01:23.920 One is English for English users and one is Japanese for Japanese users. 01:24.670 --> 01:30.340 So how will the example.com server determine on which page to serve? 01:30.940 --> 01:36.190 So during this time the accept language header comes into play. 01:37.110 --> 01:45.930 So if the accept language header is J which stands for Japanese, then the server will serve the Japanese 01:45.930 --> 01:47.040 version of the page. 01:47.580 --> 01:50.690 However, it is n which is English. 01:50.700 --> 01:54.960 Then the server will serve the English version of the page. 01:55.980 --> 02:03.930 So the server has to know or it has to extract a value from the accept language header which the client's 02:03.930 --> 02:06.420 browser will send along with the page. 02:09.370 --> 02:17.020 Now there is one more important header called content language, which basically determines the language 02:17.020 --> 02:20.410 of the body for the intended audience. 02:20.800 --> 02:26.680 Please note that it is not saying that the language of the message body. 02:27.490 --> 02:31.390 It says language of the message body for the intended audience. 02:31.390 --> 02:32.590 So there is difference. 02:32.770 --> 02:38.140 So let's take a simple example where the content language header says N. 02:38.560 --> 02:41.770 So what this basically determines is that this. 02:42.890 --> 02:48.380 The body is specific for intended audience who understands English. 02:49.250 --> 02:56.170 So if I give you a day to day example, let's say a travel guide for China. 02:56.180 --> 03:01.610 So if a person is visiting a China, there is a travel website with a travel guide. 03:01.910 --> 03:08.360 Now the travel guide is intended for English audience or the people who understands English. 03:08.540 --> 03:17.720 However, the document also contains basic Chinese sentences that can help people in day to day communication 03:17.720 --> 03:19.370 in local languages. 03:20.550 --> 03:27.420 So during that time, the document contains both English as well as Chinese based characters. 03:28.660 --> 03:33.580 However, it is specifically for people who understands English. 03:33.580 --> 03:36.810 So during that time the content language becomes Ian. 03:37.240 --> 03:44.620 Although it has Chinese characters still, as it is specific for English based audience, the content 03:44.620 --> 03:45.930 language will be Ian. 03:49.240 --> 03:56.800 So as we're talking about the Multi-language website, let me show you an example of how it works along 03:56.800 --> 03:59.200 with the accept language headers. 03:59.830 --> 04:00.850 So. 04:04.480 --> 04:12.010 I have a server and if I do a call, let me show you curl followed by header. 04:12.850 --> 04:15.910 Say header that I want is accept language. 04:18.040 --> 04:23.260 Say my preferences in which is English followed by the name of the website. 04:23.260 --> 04:25.540 Say example.com slash hi dot HTML. 04:27.480 --> 04:29.070 And the contents are. 04:29.100 --> 04:31.530 This is English version of the website. 04:31.560 --> 04:33.780 So now let's modify the header. 04:34.520 --> 04:36.080 From N to J. 04:36.110 --> 04:38.150 So J stands for Japanese. 04:38.870 --> 04:42.380 And now you see, this is a Japanese version of the website. 04:42.500 --> 04:51.050 And this is one of the reasons why the Accept language header instructs the server on what type of language 04:51.050 --> 04:53.960 it would prefer in the response. 04:55.410 --> 05:05.100 Now, again, it is very important to know the exact language followed by N or J is specified in the 05:05.100 --> 05:05.880 browser. 05:05.880 --> 05:14.310 So by default, if you are downloading Chrome or Firefox in the European or maybe even in India, then 05:14.310 --> 05:16.650 by default the language is n. 05:16.830 --> 05:23.640 However, for other languages, other countries, the language might differ in the browsers. 05:23.640 --> 05:28.050 So this is something that you can always change depending upon your requirement. 05:28.890 --> 05:36.210 So this is it about the basics of except language and content language headers in the Http protocol. 05:36.480 --> 05:41.940 So I hope this video has been informative for you and I'd like to thank you for viewing.