WEBVTT 00:05.510 --> 00:12.160 Everyone so in the last year or year we stop at installing postman and we tried posting some information 00:12.160 --> 00:19.940 to the server and last but it ended up you know telling us the method you know was not supported Glubb 00:19.950 --> 00:21.770 of MTS was checked here. 00:21.780 --> 00:25.410 So the message is not allowed the require request and you're out. 00:25.570 --> 00:27.040 So let's try and fix that. 00:27.040 --> 00:30.170 So in this video we're going to be sending to an average. 00:30.220 --> 00:39.570 X and Y and then we're going to make the server add them for us and then reply us with the weather response. 00:39.790 --> 00:41.830 So let's see how we would do that. 00:41.830 --> 00:45.790 So first of all we need to define an end point for the server to hit. 00:46.030 --> 00:55.730 So I'm going to choose the end point as it's slash and to not. 00:55.890 --> 00:58.070 OK so I'm going to add two numbers. 00:58.780 --> 01:01.990 But this time we're going to add something after the name. 01:02.020 --> 01:07.310 We're going to add methods is equal to post. 01:07.450 --> 01:09.080 So what does this mean here. 01:09.100 --> 01:15.180 It means that the message that this function should be allowed to handle is on the coast. 01:15.440 --> 01:18.290 But I can also add here get. 01:18.520 --> 01:23.380 So that means that this function should support only get now by default. 01:23.380 --> 01:27.870 Any function defined like this has methods equal get in it. 01:27.910 --> 01:30.210 So you don't have to add extra get. 01:30.400 --> 01:33.510 But if we find the post then we override it. 01:33.610 --> 01:36.750 So now this function would only accept a post request. 01:36.760 --> 01:39.650 And if you try to send them a request you would. 01:39.670 --> 01:41.440 It would give you the same error here. 01:41.440 --> 01:44.370 This method is not allowed for the requested euro. 01:44.380 --> 01:50.570 So we're saying we're only going to be allowed to post messages to hit this end point. 01:50.820 --> 01:57.520 OK so now we're going to have to find just any functions to add to the numbers. 01:58.510 --> 02:03.080 And now let's think about a bit about some about what we want to do. 02:03.130 --> 02:09.990 First thing is we want to get x and y from the posted data. 02:10.930 --> 02:20.190 That's step one step two would be to add X plus Y and story and Z. 02:21.430 --> 02:33.030 And Step 3 is to prepare adjacent and then it have the field and zent and then the song as Zed. 02:33.260 --> 02:34.080 OK. 02:34.420 --> 02:35.030 And that's it. 02:35.030 --> 02:38.860 And then Step 4 is return. 02:38.850 --> 02:52.230 Jason if I was Jason ify and then the Jason that we prepared or the map that we prepared map prepared. 02:52.450 --> 02:54.750 OK so let's take this step by step. 02:54.760 --> 02:58.450 First of all we need to get x and y which were posted from the data. 02:58.450 --> 03:00.050 So how do we do that. 03:00.370 --> 03:02.350 Well we first need to get the D. 03:02.580 --> 03:08.980 Jason that was posted to us so to do that and flask we're going to go up here and we're going to choose 03:09.370 --> 03:16.380 from Plaskett important flacid use on site and we're going to introduce a new one called request. 03:16.430 --> 03:23.710 Quest has all that nice information about the posted data that has come to this function over here. 03:23.710 --> 03:36.400 Now once you are here we're going to say Data Dictionary is equal to request and then doesn't get Jason 03:36.400 --> 03:40.300 so it has a function called get Jason and that's about it. 03:40.300 --> 03:42.210 So let's try to see what happens. 03:42.260 --> 03:46.290 Hi Jason as I did I'm Dictionnaire. 03:46.330 --> 03:50.750 OK so let's try and see what happens when when this thing over here happens. 03:50.890 --> 03:59.620 So let's let's say this right and then run a flask and then go here and then change this to. 04:00.030 --> 04:03.420 And that's what we call it. 04:03.660 --> 04:11.640 And to add two numbers and then if we send it we're going to get exactly the posted data that we got. 04:11.640 --> 04:15.610 So here we got x 1 y to this is what we send the server. 04:15.730 --> 04:17.770 And this is what we sent back. 04:17.770 --> 04:20.240 This is actually the Jason that we want. 04:20.320 --> 04:21.170 So that's great. 04:21.190 --> 04:22.310 We have received it. 04:22.480 --> 04:27.070 So that means that this data dictionary has an x and y that we want. 04:27.070 --> 04:27.850 Great. 04:28.150 --> 04:28.930 OK. 04:28.930 --> 04:37.210 So now you want to say that x is equal to the data dictionary and then the field is called X because 04:37.210 --> 04:41.940 here you were posting the field X.. 04:43.040 --> 04:44.690 Next you want to define y. 04:44.690 --> 04:48.320 So why is equal to the data dictionary. 04:49.210 --> 04:50.150 Why. 04:50.290 --> 04:53.730 Right because here we have to find x and y. 04:54.370 --> 05:05.760 Now finally you want to define zed as x plus y and then we're going to prepare the return Jaisalmer 05:07.700 --> 05:10.150 and it's going to be Zad. 05:10.580 --> 05:12.380 And then the value goes. 05:12.980 --> 05:22.550 And finally we're going to return your satisfy the return Jason and that's about it. 05:22.550 --> 05:24.560 We got that posted data. 05:24.560 --> 05:31.250 We did some computation here and we're going to apply the response which is there are Jason we've prepared 05:31.250 --> 05:33.550 it and then we're going to return it. 05:33.560 --> 05:37.740 Now how do I tell the requestor that this is a success. 05:37.790 --> 05:45.230 Well if you remember the last video we said we want to send the request with a status code of 200 which 05:45.230 --> 05:49.970 means success 404 means not found 200 means success. 05:50.330 --> 05:57.120 So I'm going to add a comment here and then I'm going to say to the user two hundred which means success. 05:57.500 --> 06:01.170 And then I'm going to receive and then see what happens. 06:01.400 --> 06:04.740 So I'll stop flask. 06:04.870 --> 06:10.100 We are on it and then we'll see what happens when we send or request again. 06:10.850 --> 06:11.730 Well we get it. 06:11.750 --> 06:16.780 Finally here we get Zed and then three three is the. 06:17.090 --> 06:18.420 What happens if we try. 06:18.500 --> 06:22.510 And then if we look here we're going to see that the return status code is 200. 06:22.730 --> 06:26.010 And we got a post at this location here. 06:26.420 --> 06:33.500 Now what happens if we you know just play along with the numbers 100 200 So that's 100 plus 200 300 06:33.500 --> 06:34.640 obviously. 06:34.700 --> 06:37.130 So we send the request and we got three out. 06:37.370 --> 06:45.600 So basically built up very many tiny API that adds to numbers where the users send the input there. 06:45.680 --> 06:48.320 And then you return the response. 06:48.320 --> 06:51.280 Now obviously we're doing a lot of assumptions here. 06:51.290 --> 06:57.290 The first assumption is that we're trusting that the user is going to send in x and y. 06:57.320 --> 07:01.100 So what happens if the user doesn't send us x and y. 07:01.130 --> 07:03.180 What happens if we do this. 07:03.710 --> 07:07.150 And then just post this information. 07:08.030 --> 07:16.550 Well we'd actually send that we get a 400 request and we should really be very careful when we're implementing 07:16.570 --> 07:16.870 it. 07:16.930 --> 07:22.550 Our You know we shouldn't really trust the user to send to always they're missing. 07:22.550 --> 07:25.130 So we have to you know here we're really trusting the user. 07:25.170 --> 07:27.290 OK I know he's going to get x y. 07:27.390 --> 07:34.730 We should always check you know check is X in data dictionary or not. 07:34.750 --> 07:35.660 And so. 07:35.900 --> 07:44.360 So not in the dictionary then we would probably return you know error or this wouldn't be Y. 07:44.360 --> 07:46.010 So let's change this to Y. 07:46.130 --> 07:50.530 And then for example area code 3 0 5 example. 07:50.600 --> 07:53.670 And so when we restart. 07:54.350 --> 07:55.880 And then we send. 07:55.880 --> 08:02.150 This time it won't crash our server but instead it's going to tell us OK you know different there and 08:02.150 --> 08:02.910 so on. 08:03.200 --> 08:12.140 So it's always better to do you know send basically was it cold to to handle these types of errors before 08:12.140 --> 08:15.170 you send these requests. 08:15.170 --> 08:17.800 So yeah that's it for the first session. 08:18.050 --> 08:23.740 Really what we've been doing here is to get familiar with these type of host requests. 08:23.810 --> 08:30.860 Jaison you know slash by or are get requests responses. 08:31.130 --> 08:38.400 You know it is a take away from this section really as you should know what get request post request 08:38.400 --> 08:46.250 what are requested is what a post is request is what our response is what a status code code is because 08:46.250 --> 08:49.400 these will be used a lot in future videos. 08:49.400 --> 08:49.810 So yeah. 08:49.820 --> 08:53.480 Thank you for watching this video and I'll see you in the next videos.